Nick Jonas Hosts GQ's New Z Zegna Collection Celebration!

Nick Jonas and his brother Joe are dapper fellas while attending GQ’s New Z Zegna Collection Celebration held at Philymack Studios on Thursday (February 5) in West Hollywood, Calif.

The 22-year-old singer and Joe, 25, were joined by Joel McHale, Chord Overstreet, Ryan Guzman, Bow Wow, Robbie Rogers, Jesse McCartney, Kendrick Sampson, Terrence Jenkins, Mayer Hawthorne, Pia Mia, and JustJared.com‘s very own Jared Eng.

PHOTOS: Check out the latest pics of Nick Jonas

“The Grammy party craziness has begun…,” Nick wrote on his Twitter account.

Also pictured: Jesse, 27, attending the 2015 Billboard Power 100 Celebration that same evening with his model girlfriend Katie Peterson at Bouchon in Beverly Hills, Calif.

FYI: Nick is wearing Z Zegna.

25+ pics of Nick Jonas and others at GQ’s New Z Zegna Collection Celebration…