Jessica Biel stunned with her amazing body at the "Runner Runner premiere" in Las Vegas on Wednesday, September 18. What's Jessica Biel's secret to her perfect body?

Jessica Biel was glowing at the "Runner Runner" premiere, where she supported her husband, Justin Timberlake, and her secret may lie in her recent two-day juice cleanse.

The 31-year-old actress shared a picture of her pressed juices via Instagram on Monday, September 16, E! News reports.

"This is happening! @eatpaleta two day detox," she captioned. "Wish me luck."

Two days later, Jessica Biel shared another Instagram picture, but this time all of the bottles were empty.

"Done! Detoxed & healthy from @eatpaleta 2 day cleanse," she wrote. "Everything in moderation, people!"

Biel is making headlines today for her outfit at the "Runner Runner" premiere, where she donned a flattering Dolce & Gabbana suit that matched her husband Timberlake's black and blue suit.

One thing that definitely isn't attributing to Jessica's fit body is Timberlake's famous pies. In the January issue of Elle, the Minnesota native revealed that Timberlake loves baking pies, E! News reports.

"He's Southern, so he's got all this influence from his grandma. He does a three-layer pie, and blueberry crunch cake, which is pretty unbelievable," she said of Timberlake, 32. "It doesn't happen all that often, thank God. Otherwise, it would be a big problem."

Justin Timberlake and Jessica Biel married in October of 2012.