Motown founder and living legend Berry Gordy proved he's sexy and he knows it by posing with his youngest son Stefan Kendal Gordy aka RedFoo from LMFAO at the Billboard Music Awards in Vegas on Sunday.

Damn they fly.

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.

LMFAO was forced to stop their concert early in Honduras last night -- when a fire burned through the concert venue ... but cops believe the blaze was no accident.

According to local news reports, the fire broke out at the Coliseo Nacional de Ingenieros ... towards the end of the LMFAO concert.

The group reportedly ended their show after smoke began to fill the arena. 

According to the reports, no one was killed in the blaze -- but at least 15 people were treated for smoke inhalation.

Cops told local media ... they suspect a "criminal hand" set fire to the electrical system. It's unclear if any arrests have been made.

After the show, Redfoo tweeted about the incident -- first joking, "Epic concert tonight!!!! Everybody in Honduras, we set the place on fire!!!!"

He also explained, "They told us that there was a fire when we were on stage.Then we went to the dressing rooms and there was smoke in the halls."

An hour later, he was more somber ... tweeting, "On a serious note. Hope everybody is safe from the fire tonight! love you Honduras!"

Motown record label founder Berry Gordy's son Stefan Kendal Gordy aka Redfoo, 36, and Berry Gordy's grandson Skyler Gordy aka SkyBlu, 24, of LMFAO rocked their hit song "Party Rock Anthem" at an event in Pennsylvania on Wednesday.

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