Hilary Duff posted this on her instagram:

http://instagram.com/hilaryduff

Sean Douglas cowrote Talk Dirty by Jason Derulo and Heart Attack by Demi Lovato. The other guy in the picture is Jerrod Bettis who was a drummer for OneRepublic before they became famous. He also cowrote Obsession by Sky Ferreira.

ETA: Jerrod also played guitar/drums on Adele's 21

I hate that song, but slay.

Her sex anthem is coming

Not you paying "Reach Out" dust.

Jerrod also played the guitar and drums for Adele's 21

when i saw the title i was like "wait..... 2 chainz?"

I'm really happy with who she's been working with the past few months! This means we'll be getting really good stuff. The wait will be SO worth it.