There were many reasons Pentatonix were able to be the first a cappella group to score a No. 1 album, but no doubt guest superstars like Jason Derulo and Think helped them get there. The pop star brought vocal game to Pentatonix standout "If I Ever Fall in Love," and now the track gets a gorgeous visual to accompany it.

Watch above as the world's favorite vocal quintet look more celebrity than ever (we see you with that face bling, Kirstin), belting it out amid colorful backgrounds and gorgeous lighting. The group joins up with Derulo for some group saaang-ing (watch out for Jason to nail a crazy-high note and Scott to follow up with an equally impressive run), with the "Naked" singer looks right at home with the PTX crew. 

Pentatonix has been killing it on the YouTube front this week. Not only did we get this stunning visual, but we also got a new Superfruit video from Scott Hoying and Mitch Grassi who delivered a must-see medley of Rihanna's Anti album

The North American leg of PTX's new world kicked off in Sunrise, Fla. last night. Check out why you gotta see them (and 22 more artists!) on tour this spring. Then watch our report about why a cappella has become a YouTube obsession below: