Taylor Swift is turning her Los Angeles residency into a star-studded eaffair after duetting with Jason Mraz during her concert on Wednesday (24Aug11).

The Love Story hitmaker is playing a string of shows at the Staples Center and earlier this week (begs22Aug11) she thrilled fans by bringing Justin Bieber onstage for a rendition of his hit track Baby.

And Taylor Swift introduced another special guest to the crowd on Wednesday, teaming up with Jason Mraz to perform his song I'm Yours.

In a post on her Twitter.com page, she writes, "I couldn't love LA crowds more. I can't believe how awesome tonight was. And thank you Jason Mraz for singing I'm Yours with me!!"