How mad was Jay-Z when rapper Lil Mama muscled into his duet with Alicia Keys at the MTV Video Music Awards? Though he tried to stay cool onstage, a backstage source tells us, “He went ballistic. He was screaming at the MTV producers about the lack of security. He apparently thought at first she was just a fan. Beyoncé finally calmed him down.”

“Perez will take legal action against anyone who chooses to resort to physical violence as a means to respond to criticism they do not like,” Bryan Freedman writes us in an email. “It is my understanding that criminal assault charges have been filed against the band’s manager, Polo Molino, and we are conducting a legal investigation as to whether Will.I.Am encouraged and/or instructed Molino to engage in this physical assault.”

“Rest assured that anyone who physically assaults Perez Hilton or encourages others to do so because they cannot handle a little criticism will be sued as quickly as I can type,” he writes. “His first amendment rights will not be infringed upon through fear, intimidation or violence.”

The latest drama unfolded after Lohan left a night at London’s Crystal club at 1am to go track down Ronson who was partying at Bungalow 8 with her brother Mark and his girlfriend Tennesse Thomas.

But it wasn’t long after Lohan arrived Sam and her clan decided to abort their night and leave Lindsay in the club. Unhappy, determined Lilo then followed them in her own car over to Ronson’s West London hotel to try and hang out with them again.

So stressed out, Lohan was pictured through throwing at hissy fit at her driver as he passed Ronson outside. Sam quickly scurried inside to avoid the storm but it looked all too late as Lohan made her way inside. Anyone got a guide to rejection we can pass on?