Everyone earns a sweet reward sometimes, and there is no sweeter reward than a visit from Lil’ Sweet. He’s a tiny lil’ rock star with the voice of an angel and an unlimited supply of Diet Dr Pepper—the sweetest diet soda around. In this spot, Lil’ Sweet delivers a Diet Dr Pepper to a deserving dad who spent all day building his daughter a miniature playhouse with the tiniest of tools. But don’t expect Lil’ Sweet to hang around too long, he has places to go and pets to hit the road with.

We needed a rock star. We needed someone with charisma, talent, and the voice of an angel ­ but we also didn’t want someone who would overshadow the creative.

So when you need to cast a tiny little pop star, who better to hire than someone someone who’s been a pop star. Enter Justin Guarini, a sexy, sweet­-voiced singer with stage presence honed in front of a national audience. Justin shot to fame in 2002 on the first season of American Idol. But when he finished as runner­-up to Kelly Clarkson, it looked like his dream of being a pop star was over. But you can’t keep a great talent down. Justin still had a second act to play: Lil’ Sweet! Quite the comeback.