Hilary Duff has traded in a mouse for a frog. The teen sensation, who in May walked away from the Lizzie McGuire franchise when Disney failed to show her the money, is headlining two hourlong specials on the WB, the first of which will air in September. Titled Hilary Duff's Birthday Celebration (she turns 16 on Sept. 28), the star-studded event also ties in with the release of Duff's first solo CD, Metamorphosis. Speaking of Duff, the actress-singer showed up at the WB's TCA party last night in Hollywood on the arm of ex-Dawson's Creek hunk (and upcoming star of the network's drama One Tree Hill) Chad Michael Murray. However, they both told me they were "just friends." Lies! More lies! To see a pic of the happy couple, click here.