SingerJoe Jonas, formerly of the Jonas Brothers band, has broken up with his girlfriend of 20 months, Blanda Eggenschwiler. "Joe and Blanda have mutually decided to part ways," his representative told Us Weekly Tuesday. "The split was amicable and the two remain friends, with great respect for one another." Zurich-born ex-model Eggenschwiler is a well-known graphic designer and illustrator. Jonas, who turns 25 on Aug. 15, has previously dated such singers and actresses as Taylor Swift, Camilla Belle, Demi Lovato and Ashley Greene, said Us.