Dated before ... Miley Cyrus and Patrick Schwarzenegger have been dating for a few months. Picture: Splash. Source: Supplied

An insider tells The New York Post: “Maria was going to go to Art Basel to spend some time with Anthony, but when she heard Miley was going to be there with Patrick, she cancelled.”

Like his dad ... Patrick Schwarzenegger in South Beach Miami. Picture: Supplied. Source: Splash News Australia

Bad influence ... Maria Shriver is worried about Miley Cyrus’s influence on her son, Patrick. Picture: Supplied. Source: Supplied

Cyrus, who’s been dating Schwarzenegger for months, was booked at the last minute to perform at Tommy Hilfiger and Jeffrey Deitch’s party at the Raleigh, and she quickly became the talk of Art Basel by stripping down onstage to silver pasties, smoking a joint, and dancing with a topless woman and a man dressed as a penis.

Close family ... Patrick Schwarzenegger, Maria Shriver and Katherine Schwarzenegger attend The Grove's 12th Annual Christmas tree Lighting Spectacular last month. Picture: Splash. Source: Supplied

Cyrus was inseparable from Schwarzenegger, and partied at high-end strip club E11even three nights in a row. One night she made out with Paris Hilton there, sources reported. On another, she was carried out of the joint after heavy drinking.

Rich and famous ... Miley Cyrus, her boyfriend Patrick Schwarzenegger, and Cody Simpson walk around the pool in Miami together. Picture: Splash. Source: Supplied

A different source tells us Cyrus and Schwarzenegger were heard arguing at the Raleigh over her drug use, and that “Patrick is antidrugs, but Miley doesn’t give a [bleep]. She smoked marijuana onstage, and God knows what else she was on for the rest of the weekend. She and Patrick were heard fighting about it, and also because his uncle Anthony had trouble getting into her party at the Raleigh. There’s no way Patrick can be linked to drug use; his family is American royalty.”

Ironically, Shriver simultaneously posted a video on Twitter about the dangers of binge drinking.

She wrote on Friday (the night Miley was carried out of E11even), “Worth showing yr kids & talking to them about who they are & will be this weekend.”

Anthony Shriver’s a resident of Miami, where he runs charity Best Buddies. He and Cyrus were seen getting on famously at another private party.

Governator ... Arnold Schwarzenegger (2nd L) arrives with then wife Maria Shriver (3rd R) and their four children Christopher (L), 6, Patrick (3rd R), 10, Katherine (2nd R), 13, and Christina (R), 12, for his inauguration as governor of California in November 2003. Picture: AFP Source: AFP

“Patrick’s relatives, particularly Anthony, really like Miley,” another source said. “She does a lot of good work for charity. While she can be wild, she is a sweet person.”

Shriver’s and Cyrus’s reps didn’t get back to us.