Jessica Alba jumper santa monica smile denim floral

Jessica Alba can't stop smiling! No, but really -- she's just so happy, one might even call her ... giddy!

On Thursday, the 33-year-old stepped out in a floral romper and a denim overshirt when she headed to her offices in Santa Monica, Calif. We wonder what put a pep in Jess' step? Maybe she's just jazzed about the sunny LA weather!

Over the weekend, the Dark Angel star celebrated her 33rd birthday with a bunch of girlfriends in Las Vegas. The gals partied down poolside at the Wet Republic Ultra Pool at the MGM Grand Hotel. The mother-of-two, her friends and her hubby Cash Warren kept the celebration going with a big birthday bash at Hakkasan nightclub.

The actress was enjoyed a gluten-free dinner, drinks and a three-tier fondant cake decorated with cherry blossoms, "Happy Birthday Jessica!"

We'd be smiling too if we went on that weekend trip!