Today’s celebrity rundown (11 photos)

Celebs unite for the Fall/Holiday 2011 Op marketing campaign. FOX’s ’Glee’ actors Mark Salling and Chord Overstreet, reality star Rob Kardashian, actresses and recording artists Aly Michalka & Kat Graham and Brenda Song of ’The Social Network’ are featured in the campaign.

On set of ‘What to Expect When You’re Expecting,’ Cameron Diaz shows off her fictitious baby bump.

JLo’s Spanx make an appearance while she shoots her new music video for ‘Papi.’

She’s looking fierce.. Janet Jackson’s new Blackglama ad has been released.

Megan Fox joins Leslie Mann on set of ‘This is Forty.’

Reports show ‘The World According to Paris’ has been dropped from the Oxygen channel. A rep from the show told press:

“The show just recently completed its run and no pick up decision has been made.”

Meanwhile, Paris Hilton wigs out shopping in LA today.

The other ‘Simple Life’ star Nicole Richie mingled with guests at the Charlotte Ronson Sephora Beauty launch party last night. She wore a black dress/jacket/heels combo with a green velvet purse.

Scarlett Johansson’s latest Dolce & Gabbana’s creamy foundation ads are super airbrushed.

What do you think of JoJo’s midriff look? The 20-year-old wore this at Taylor Swift’s concert.

Behind the scenes look: Heidi Klum’s photo shoot for her new fragrance Shine.