By the look on RedFoo‘s face … you wouldn’t think he’d just been hit with a $7 million lawsuit … but that’s exactly what happened right as this photo was taken.

The LMFAO DJ was on his way into the “American Idol” set in L.A. yesterday … when he got SERVED with a $7 million lawsuit filed by the band’s former management company.

The management company is suing for breach of contract … claiming it took LMFAO’s career “from 0 to 60” … only to be kicked to the curb when the big bucks started rolling in.

But RedFoo didn’t seem too concerned when he got slapped with the suit yesterday … smiling and laughing … and then posing for a pic with the tattooed process server.

Everyone’s a fan.