Ariana Grande and Nathan Sykes
photo: Corbis

Ariana Grande is back with her ex boyfriend Nathan Sykes — but it’s not what we’re all thinking. The “Focus” singer lent her vocals to a new version of Syke’s piano ballad, “Over and Over Again,” which dropped on iTunes on Friday. 

The track, which was originally released back in October, is the second single off Nathan’s still untitled album — his first solo project since his band The Wanted took a break in 2014.

Grande and her former beau both took to Twitter on Friday to announce their new collaboration, proving that relationships with exes can evolve into different partnerships far after the romance flatlines.

Here are six other celebrity exes that ended up as coworkers post-breakup.

1

JLo and Marc Anthony

jennifer lopez and marc anthony
photo: Corbis

Besides co-parenting their twins Max and Emme, Jennifer Lopez and Marc Anthony have collaborated professionally since the couple divorced back in 2011. The two started a talent show together called Q’Viva that focused on finding Latino talent.

2

Kaley Cuoco and Johnny Galecki

Kaley Cuoco and Johnny Galecki
photo: Corbis
After dating for two years, the Big Bang Theory co-stars remain great friends, even sparking rumors of a rekindled romance at this year’s People's Choice Awards.

3

Nina Dobrev and Ian Somerhalder

Nina Dobrev and Ian Somerhalder
photo: Corbis
The two remained a couple on the CW’s Vampire Diaries even after their real life romance ended. 

4

Cameron Diaz and Justin Timberlake

Cameron Diaz and Justin Timberlake
photo: Corbis
We almost forgot these two used to be an item. But even since their split back in 2007 after four years of dating, the two got back together on the big screen in the movie, Bad Teacher.

5

Gwen Stefani and Tony Kanal

Gwen Stefani and Tony Kanal:
photo: Corbis
Way before Blake Shelton (and even before her marriage to Gavin Rosdale), Gwen Stefani and No Doubt band mate Tony Kanal used to date. But their break up didn’t get in the way of making music together. In fact, Stefani’s 2005 song, “Cool” is said to be about her ex beau.

6

Kristen Stewart and Robert Pattinson

Kristen Stewart and Robert Pattinson
photo: Corbis
Everyone’s favorite vampire couple, Stewart and Pattinson continued to costar in Twilight movies together even after breaking up.