Oh Dear! Mischa & Cisco: I would have dumped him too!

Mischa Barton, 21, can't handle the naked truth about Cisco Adler. A source tells Us Weekly the pair parted ways after nude photos of Adler, 28, surfaced on the Web.

This NSFW pic of Adler hanging loose Click Here, which turned up among Paris Hilton's possessions when the contents of the heiress' unpaid storage locker were posted online at parisexposed.com (the site was later shut down).

Says a source, "They had a blowup. She was furious."

Barton's rep had no comment, and Adler's could not be reached.

The former O.C. actress has been dating the rocker since August 2005, two months after she ended her one-year relationship with oil heir Brandon Davis. Adler was once engaged to Kimberly Stewart, daughter of Rod Stewart.

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