Katy Perry looks jubilant at Lauren Sanchez's book launch just hours before ex-husband Russell Brand is jailed for rape and sexual assault

Katy Perry was seen out smiling just hours before her ex-husband Russell Brand was sentenced to 10 years behind bars for sex crimes. 

The 42-year-old pop star didn't let the impending sentencing stop her from supporting her friend fellow astronaut Lauren Sanchez, who launched a new book in Los Angeles on Sunday. 

Perry flashed a big smile while dressed in black capris, and a cranberry-colored cardigan appearing at Sanchez's event alongside fellow A-listers Sydney Sweeney, Kris Jenner and Elsa Hosk. 

'Yesterday we brought winter to LA, and friends, their kids, and Santa all showed up for a reindeer who can’t read a compass,' Sanchez wrote beneath a snap of smiling Perry in an Instagram post shared on Monday, promoting her book The Fly Who Flew to the North Pole. 

On the same day in London, Brand, 51, faced a starkly different reality, handed down a 10-and-a-half year sentence for one count of rape and three counts of sexual assault.

The disgraced comedian could also stand to lose some of his estimated $20 million fortune in compensation and civil claims, a top British lawyer told the Daily Mail last week.

Katy Perry was seen smiling at an event on Sunday just hours before her ex-husband Russell Brand was sentenced to 10 years in prison (Source: Lauren Sánchez Bezos Instagram)

Perry and Brand were married for 14 months from October 2010-December 2011 and their divorce was finalized in July 2012; pictured in 2009

Brand and Perry began dating in 2009 and were married the following year. The couple split in 2011, with Brand dumping his pop star wife via text.

That brutal moment was captured in her documentary Katy Perry: Part Of Me, with the text coming through just minutes before the songstress was due to perform to thousands in Brazil.

The film showed Perry being comforted by her team backstage as she sobbed uncontrollably. 

Reflecting on their 14-month marriage in a 2013 interview with Vogue, Perry said: 'He's a very smart man, and I was in love with him when I married him.

'Let's just say I haven't heard from him since he texted me saying he was divorcing me December 31, 2011.'

'I felt a lot of responsibility for it ending, but then I found out the real truth, which I can't necessarily disclose because I keep it locked in my safe for a rainy day,' she cryptically concluded. 

In the years since, Perry has maintained what fans have described as 'a dignified silence' about the break-up – but that could soon change. 

This past weekend, The Mail on Sunday reported that sources close to the star claim she was waiting for the outcome of Brand's trial before finalizing a deal to detail her 'dark marriage' to the star.

Perry flashed a big smile while dressed in black capris, and a cranberry-colored cardigan for the gathering as Sanchez promoted her children's book The Fy Who Flew to the North Pole (Source: Lauren Sánchez Bezos Instagram)

A well-placed Hollywood source said: 'Katy has received multiple offers over the years to tell her story but would not consider anything until after the trial. She has a lot to say.

'At the moment she's considering a Netflix-type series and an autobiography. She and her team have been in active discussions.

'There is a lot about that marriage which people don't know. It was a very dark period in her life.'

The source claimed her team have been in touch with streaming giants including Netflix and Hulu.

Perry and Brand began dating in 20019 and tied the knot the following year. They were only married for 14 months before the comedian dumped his songstress wife via text (Perry and Brand pictured in 2010)

Earlier on the weekend, Perry was pictured partying in Thailand after performing a private concert in Phang Nga. 

One person at Perry's exclusive concert, hosted by cyber-security giant Wiz for its employees, said she was 'a world away' from the court procedures involving Brand.

The woman, a caterer at the event, said: 'Katy was so friendly, happy and fun. It seemed like she was really enjoying her life and enjoying the concert.

'She didn't mention her ex at all. It looked like she was a world away from all of that.'

Footage from the performance showed Perry talking with the audience before belting her hit songs Firework and Roar as the crowd sang along.

Brand was found guilty following a four-week trial at Southwark Crown Court in London on Monday. 

Judge Joel Bennathan said the entertainer is a sexual predator ​who believed 'fame meant you could act how you liked, when you liked, unhindered by the rules by which decent people live.'

'Whatever ⁠women wear, wherever they go, indeed whatever they drink, they retain the right to say no and to demand justice from the criminal courts when sexual predators ​like you, Russell Brand, act without their consent,' Bennathan said.   

Prosecutors had said Brand raped a young woman until she bled, and attacked three female strangers, in some cases within seconds of meeting them at the height of his fame, including one attack that took place shortly after he met Perry. 

The court also heard how Brand, who once boasted he would not relent in his pursuit of sex before getting his 'birthright orgasm,' ignored pleas from women for him to stop.

In the rape case, prosecutors said, Brand sexually assaulted a 21-year-old fan he picked out of the crowd in 2009.

He pushed the woman face-down into a pillow on his 'enormous' bed and removed his condom while raping her at his Hampstead mansion, leaving her struggling to breathe.

She was left bleeding from her anus and afterwards said Brand ordered her to 'clean up the mess you've made' before switching on the TV to watch the science fiction series Quantum Leap.

Perry and Brand pictured in 2011, shortly before their split

Meanwhile, Perry has been happily dating former Canadian Prime Minister Justin Trudeau for more than a year, with the couple making their red carpet debut at the 25th Annual Tribeca Festival in June.

They attended the movie fest in support of the concert film Katy Perry: The Lifetimes Tour – Live from Paris. 

The Firework hitmaker mentioned her relationship at the event, telling People she is 'very in love.'

She said at the time: 'I feel like a more grounded person in so many aspects of my life. 

'I am very in love. And actually, that [Paris] show was after I met the love of my life and so I felt very anchored by that because I'm a little bit like a rainbow kite.' 

A source told the Daily Mail earlier this week that Trudeau would support Perry speaking out about her ex.  

Perry has been dating former Canadian Prime Minister Justin Trudeau for more than a year (The pair are pictured in September)

'Justin has generally stayed away from any talk on Russell, but if she brings it up, he is very supportive.'

Far from talking her out of a tell-all, the seasoned politician is more than happy to let Perry call the shots.

'With his political past, he knows how to deal with storms, and if Katy wants to do a book and a doc, he is going to let her fly and do anything she wants,' the source said.

'If she asks for help or if it looks like she needs help navigating through it all, he has no problem being there for her.'

And, the source added, the timing could not be more significant.

'This will come as she enters what she feels is the happiest and most fulfilling chapter of her life,' our insider said. 'She's a mom, she's found a relationship with Justin that she describes as nothing short of magic, and, perhaps for the first time in a long time, she feels incredibly comfortable with who she is.

'That's really what she wants to capture.'

After Brand and prior to her relationship with Trudeau, Perry was engaged to Orlando Bloom.