(Look Above.) Remember this photo of Lindsay Lohan snuggling up to attached new dad Joel Madden as the Good Charlotte rocker deejayed at a Cinco de Mayo party in Los Angeles’ last Tuesday night? Joel’s girlfriend, socialite Nicole Richie, has been left enraged by the image of Madden and Lohan getting cozy at L.A’s action-packed Crown Bar while she was at home-alone-caring for the couple’s four month old daughter, Harlow Winter-and trouble may be just on the horizon for the seemingly happy family.

Nicole was immediately alerted to the situation by her arch-frenemy Paris Hilton, who sent her a devastating text message: Lindsay was all over Joel!

“Their heads were practically touching, and he had his leg over hers,” a spywitness spills to Star Magazine. “Joel has a flirtatious side, and he definitely wasn’t turning her away.”

Nicole frantically tried to call Joel, but he wasn’t answering his phone, the tabloid report continues.

“He was so zeroed in on Lindsay, he never heard his cell ring,” a friend of the couple tells Star. “Nicole felt so incredibly helpless and upset that she threw her phone against the wall in a rage.”

Developing….