Former The OC star Mischa Barton has blasted reports she cheated on boyfriend CISCO ADLER at a London rock gig this weekend (08-09JUL06). The TV beauty was branded unfaithful in British tabloids after reportedly being spotted snuggling up to a mystery man after a Wolfmother concert. But the 20-year-old insists she's totally besotted with Adler, adding, "We're very much together. I'm very happy with him."