Out and about: Cameron Diaz, Martina Navratilova, Mario Lopez, Judah Friedlander

That was Cameron Diaz strolling through the lobby of the Ritz-Carlton Saturday night.

"30 Rock" actor Judah Friedlander (the guy who wears the ironic trucker hats that stopped being funny about five years ago) did a surprise set at Helium Comedy Club (2031 Sansom) Saturday where his friend Ted Alexandro was the headliner.

Mario Lopez at The Pool After Dark at Harrah's Atlantic City. Feb. 18, 2012 (Photo: Tom Briglia/PhotoGraphics)

Tennis great Martina Navratilova was among a party of five Saturday at Davio's (111 S. 17th) where she had cheesesteak spring rolls, calamari and bronzino and an expensive red wine.

Read more from our column in Monday's Daily News.