Selena Gomez's new hit single, 'Who Says,' is an anthem meant to amp up your self-esteem, and what could make a teen girl feel better about herself than getting a rave from one of your idols? That's what happened to Selena at an Oscar party last month when she ran into Reese Witherspoon.

"I about had a heart attack, she's amazing," she told me. "So I walked up to her and was a total goober and I was like, 'Can I have a picture with you?' And she was like" -- in a spot on Reese impression -- "'Of course! Oh my goodness, If your song 'Naturally,' if I hear that one more time ... My daughter loves it!'"