Joel Madden and Lindsay Lohan

With baby mama Nicole Richie at home caring for little Harlow Winter Kate, Joel Madden was spotted cozying up to Lindsay Lohan at the Hornitos’ Cinco de Mayo party.

Joel was dejaying for the party, but according to sources, the Good Charlotte rocker was more interested in La Lohan than spinning records.

“Their heads were practically touching, and he had his leg over hers,” says one onlooker. “Joel has a flirtatious side, and he definitely wasn’t turning her away.”

Paris Hilton reportedly sent a text message to her on-again off-again BFF and let her know what was going down: Lindsay was all over Joel!

So how did Nicole handle the news? She immediately tried calling Joel, who didn’t answer because he “never heard his cell ring,” a friend of the couple’s tells Star magazine. “Nicole felt so incredibly helpless and upset that she threw her phone against the wall in a rage.”

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Filed under: Joel Madden, Lindsay Lohan, Nicole Richie