After spending the last week with boyfriend Justin Bieber, Selena Gomez can't wipe the silly smile from her face! And we kinda love it...

The 22-year-old singer/actress looked amazing when she hosted the Adidas NEO fashion show at The Waterfront in New York City on Wednesday for Mercedes-Benz Fashion Week. Later in the day, Selena posted a pic of a letter from a young fan on Instagram and wrote, "What I love to end my day to." Funny she's made no mention of the Biebs -- or his arrest over the Labor Day weekend.

Bieber was taken in to police custody in Canada on Friday after apparently crashing his ATV into a minivan driven by paparazzi. Selena was riding behind him, and local authorities say there was a physical altercation between Justin and a photographer, so the bad boy pop star now faces charges of dangerous driving and assault. Biebs will have to appear in court later this month...