Nick Jonas had a special dinner companion at Philippe West Hollywood recently. The rocker was enjoying a leisurely dinner with Selena Gomez, along with his brother Joe. The group picked a spot in the private wine room near the back of the restaurant. Still, an onlooker says, "Nick led [Selena] through the restaurant - and they seemed close." Characterizing the two as "very friendly," the onlooker adds, "[Nick] was a gentleman, making sure the crowd didn't bombard her."