The former Hills star donned a figure-hugging blue patterned dress for the grand opening of the Hard Rock Hotel in Palm Springs on Thursday (6 March).
That obviously explains the guitar then!
Audrina's a great choice to help launch the famous music-themed hotel as she's always been a rock chick and Hills fans will remember she previously worked at a record label and is a massive music fan.
Her appearance at the Hard Rock came a few days after she joined singer-songwriter Lita Ford on stage during a concert in Las Vegas, although modest Audrina later tweeted: "Last night was fun performing with Lita Ford but I'll definitely leave the singing to her, haha."
The pretty brunette is currently the host of US travel show 1st Look, which follows her as she trots around the States visiting the hottest restaurants, shops, night spots and experiences.
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