It was all about princess power on Saturday as some of Hollywood’s finest stepped out for the premiere of Sofia the First: Once Upon a Princess.

Cast members Sara Ramirez and Wanye Brady, who voice characters in the animated release, celebrated Sofia with help from Tiffani Thiessen, Ian Ziering, Jason Lee, Joey Lawrence and their adorable family members.

Sofia the First: Once Upon a Princess follows the journey of Sofia, a little girl whose life suddenly changes when her mother marries the king.

The film also features some of Disney’s most beloved characters from the past: Cinderella and the fairies from Sleeping Beauty, Fauna, Flora and Merryweather.

Sofia the First: Once Upon a Princess, will premiere on Sunday Nov. 18 on the Disney Channel.

Check out the star-studded gallery, above, for highlights from Saturday’s red carpet gathering for ‘Sofia the First.’

Former Saved by the Bell star, now mother-of-one Tiffani Thiessen has a tried and true tip to staying healthy and getting your body back after having a baby — homecooking.

“I cook a lot at home, which I think a lot of the time when you cook at home you can really know what you put into your body,” the 38-year-old told Celebuzz in Beverly Hills, Calif.

“(Also) running around with a kid definitely helps.”

What other advice did this Hollywood mom have for other mothers? 

Thiessen – who gave birth to her first daughter Harper two years ago — says it’s hard juggling being a parent and a thriving career, but it can be done.

“It is hard to be a mom and working, to be career-driven and get it all done, but you do it — we’re multi-taskers,” Thiessen said on at 2nd Annual Red CARpet Event to raise awareness about the importance of child passenger safety.

So what are her tips for fellow mommies?

“There is not just one, there is a million — sleep when you can, breath, take deep breaths.”

Thiessen is about to get a whole lot busier too. She just wrapped shooting USA’s White Collar and is about to film a pilot for the Food Network Channel, where she’s sure to be cooking up a storm.

Who says you can’t get your body back after baby?!

White Collar star Tiffani Thiessen gave birth to her first daughter, Harper Renn, in 2010 but has since been able to drop 45 pounds, and we think she looks fabulous.

While there are some Hollywood ladies who drop the weight in the blink of an eye, we love that Tiff took her time to get back in shape. We can relate, girl!

Check out other photos of slimmed down celebs in the gallery!

These stars have a mutual admiration for each other! Justin Bieber showed up to the 2011 MuchMusic Awards on Sunday wearing a T-shirt of Saved By the Bell character Kelly Kapowski, and actress Tiffani Thiessen (who played Kelly in the hit sitcom) showed she was flattered by copying the teen pop star.

Showing up at a Horrible Bosses screening in NYC on Thursday night, Tiffani stepped out wearing a Justin Bieber T-shirt! Which do you prefer: Justin wearing a Kelly shirt, or Kelly (i.e. Tiffani) wearing a Bieber top? Vote on the poll and be sure to leave us a few comments!

Last weekend, the Biebs hit the red carpet at the MuchMusic Awards looking all kinds of fly in his signature look — a blazer and sweet shades. Despite having Kelly on his T-shirt, that didn’t stop Justin from flirting with his girlfriend Selena Gomez onstage. 

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