Nicole Richie went all out while shopping yesterday in L.A. for beau Joel Madden’s 29th birthday.

Rocking her sexy post-baby bod, the new mom, 26, hit up Alpha: Gear for Gents and a nearby party shop, where she bought balloons, party favors, a birthday banner and greeting cards that read, “Pushing 30” and “You’re the best dad ever — and I’m not pulling your leg.” (Madden turns 29 today.)

Richie, who wore a diamond “H” necklace in honor of her daughter Harlow, was also photographed hauling three black boxes out of a Marc Jacobs store in Beverly Hills.

Meanwhile, Richie’s pal Paris Hilton got the party started this weekend for her new squeeze Benji Madden, Joel’s twin brother.

The 27-year-old heiress (who flashed a band with the initials “B.M.” on her wedding finger while Benji wore a "PH" ring on his ring finger during an outing Monday) surprised him with a cake at Las Vegas’ LAX nightclub Saturday night.



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