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Motely Crue frontman Vince Neil is under criminal investigation by Las Vegas police after he allegedly attacked a woman for wanting the autograph of his pal, actor Nicolas Cage.

TMZ is reporting that Vince and Nic were at the Aria Hotel on the Las Vegas Strip on April 7 when a woman walked up to the actor and asked for an autograph. Vince then allegedly got behind the woman, grabbed her by the hair and pulled her to the ground.

Vince was cited for battery but was not taken to jail.

A video (also posted to TMZ) after the incident taken in the valet area of the hotel seems to show Nic and Vince fighting. However, it appears that Nic was actually trying to restrain his pal and calm him down. Nic can be seen screaming at Vince telling him to "stop this s--- now."

Other people are heard telling the famous duo that they're being filmed on camera.

Vince was the epitome of happiness the evening before in which he was seen checking out the newly opened T-Mobile Arena in Vegas with friends, including former "Lifestyles of the Rich and Famous" host Robin Leach.

The two sipped champagne and watched The Killers and Wayne Newton christen the arena from the Hyde Lounge VIP area.

Vince has certainly had his fair share of run-ins with the law in the past. In 2011 he served 10 days in jail for a DUI conviction. Later that year he plead guilty in a misdemeanor disorderly conduct case for an alleged confrontation he had with his ex-girlfriend.

On New Year's Eve of 2015, Motley Crue played its final show in Los Angeles. Afterwards, he told the Las Vegas Review-Journal that he isn't slowing down anytime soon.

"I'm excited about the future," Vince said. "I've had a solo band for the last 15 or so years, maybe longer than that. And when Motley doesn't tour, I'm always on tour with my solo band."

He continued: "The thing is, though, it's exciting because, you know, Motley Crue takes up 99 percent of your time. And now you get Motley out of the picture, and now you can really focus on solo career and other businesses and anything you want to do. So it's kind of an exciting time, thinking about what I could do with all this time I have now. It's going to be sad that we're no longer playing together, but you know, it's progress, I guess."