Talk about a picky eater!

For a March meal at Il Pastaio in Beverly Hills (known for its risotto), fashion designer and former Spice Girl Victoria Beckham, 37, ordered . . . lettuce! "All I saw her eat was arugula," an onlooker tells the new issue of Us Weekly (out now). "Not even any salad dressing!"

It's not the first time the lithe mom of four, who's a regular at the restaurant, has ordered the leafy green. Says an insider: "She orders like that all the time!"

For more details on Beckham's bizarre eating habits, watch the Hot Stuff video (above), as told by Us Weekly Senior Editor Ian Drew and Entertainment Tonight's Christina McLarty!

Also in the roundup: Maroon 5's Adam Levine is blindsided by his breakup with supermodel Anne V, Aubrey O'Day dishes on her feud with Celebrity Apprentice costar Arsenio Hall, and much more!