Selena Gomez has been on a roll lately! She just turned 18, released "Ramona and Beezus", and in September she'll be releasing her new album, "A Year without Rain". Selena recently spilled deets on the record, including the fact that she collaborated with Katy Perry on one of the songs! Katy will be singing background vocals on the track, which she wrote and gave to Sel for the album. Katy is known for putting out songs that are catchy and fun (like her amazingly popular "California Gurls") and Selena's said that her album is going to be full of up-beat songs that are great to dance to. Sounds like a perfect pairing!