Mischa Barton has ended her relationship with musician CISCO ADLER after nude photos of him appeared on the Internet. The OC star was reportedly shocked when pictures of her boyfriend turned up among Paris Hilton's possessions when the contents of her storage locker were posted online at ParisExposed.com. According to American publication Us Weekly, the pair parted was soon after the nude shots of Adler, 28, surfaced on the website. A source says, "They had a blowup. She was furious." Barton, 21, had been dating the rocker since August 2005, two months after she ended her one-year relationship with oil heir BRANDON DAVIS. Adler, who is the lead singer for the band Whitestarr, was once engaged to Rod Stewart's daughter, KIMBERLY.