Selena Gomez is 18 now and has posed for some more grown-up photos lately, but for the new Dream Out Loud clothing campaign, she goes back to her Disney roots by reverting to the wholesome, all-American looks her fans love! These shots for the spring 2011 ads for the Kmart clothing line show Selena as a fresh-faced farm girl—is she trying to position herself as the opposite of wild child Miley Cyrus or troubled Demi Lovato?

It’s no secret that Selena is having a romance with teen idol Justin Bieber, so maybe she doesn’t want to bring more attention to the fact that she’s two years older than the singer. Especially since some of Bieber’s tween fans are already snarking that Selena’s too old for their guy! The teen lovebirds have kept things pretty quiet until last weekend, when the two were seen walking hand-in-hand on Santa Monica Pier.

Justin’s film “Never Say Never” premiered in Hollywood last night and Selena hit the red carpet in an eye-catching short purple dress, but the pair was not spied together. Will these adorable kids go public soon?