The singer made a surprise appearance at friend Mike Will Made It's show at South by Southwest

Credit: Kevin Mazur/WireImage

Nothing cures boyfriend blues like a massive party.

A source tells PEOPLE that Miley Cyrus is “super bummed” about recent photos of Patrick Schwarzenegger getting close with a female friend, but you wouldn’t know it by looking at her Instagram.

The “Wrecking Ball” singer made a surprise appearance at South by Southwest in Austin, Texas, on Thursday, taking to the stage to perform at Vitamin Water-sponsored Fader Fort alongside pal Mike Will Made It and current hip-hop “It” boys Rae Sremmurd. (The same duo who inspired Cyrus to twerk earlier in the day.)

Cyrus, 22, shared plenty of party pictures from Thursday night, and a source says that she is trying to keep her spirits up in the wake of Schwarzenegger’s scandal.

She’s in town with best friend Cheyne Thomas, who was also by her side when she danced along with Zoë Kravitz and Victoria’s Secret model Stella Maxwell on Thursday.

Meanwhile, Schwarzenegger has been quiet on social media after denying that there was anything untoward going on in the photos that surfaced earlier this week.

“Omg. It’s one of my best friend’s girlfriend,” he Tweeted on Monday. “Would NEVER do anything against my GF Girls have guy friends and guys have friends that are girls.”

Cyrus and Schwarzenegger have been dating since November but have known each other for years. The son of Maria Shriver and Arnold Schwarzenegger was the singer’s first public boyfriend since splitting from former fiancé Liam Hemsworth in September 2013.

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