Disney darlings Selena Gomez and Demi Lovato posted a witty video on YouTube and guess who couldn't wait to get in on the fun? Teen queen Miley Cyrus and her best friend Mandy! The inseparable tweens' parody of Selena and Demi is hot again on YouTube -- with recent rumors of a new feud brewing between the two over Miley's reported ex Nick Jonas. Reps tell ET that Selena and Nick are "just friends." Check out Selena and Demi's video here and Miley and Mandy's here.