If there ever was a musical crossover success, it has to be Taylor Swift. Her recent 4 show run at the Staples Center is the perfect example.

Taylor Swift had a star-studded week in Los Angeles that centered around her four sold-out shows at the Staples Center. CMT Daily Roundup reports she ended the City of Angels run with a couple of special guests. Ellen DeGeneres took the stage armed with a maraca and triangle for “Our Song,” Sunday night. The evening before, Taylor performed Nicki Minaj’s “Super Bass” with the singer herself. The excitement wasn’t limited to the stage, though, the 21-year-old grabbed lunch with Nashville native, actress Reese Witherspoon. According to US Magazine, the duo stepped out to lunch at Boa Steakhouse in Beverly Hills Friday, and Reese even gave Taylor a ride home after.

You can see Ellen DeGeneres’ performance at about the two minute mark at http://ow.ly/6fXhH. You can also see Nicki Minaj and Taylor sing “Super Bass” at http://ow.ly/6fXIR.

 Taylor and one of her other Staples Center show collaborators, Justin Bieber, have reportedly written a song together. Record producer Kuk Harrell tweeted about it last week, saying: “Wow!! Got to see @justinbieber & @taylorswift13 write a song together last night!! SMASH!!!! SMASH!!! SMASH!!! Let's do it again Yall!!!”

 Justin and Taylor are collaborating again, Access Hollywood is reporting that MTV’s Punk’d is back. The show’s first victim? Taylor Swift. Every episode will have a different celebrity host, with Justin Bieber helming Taylor’s.

You can hear Taylor Swift every day on KIXS 108.