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

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 CelebrationMore Here! »

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Jesse McCartney Reps 'Young & Hungry' At People's Choice Awards 2015

Jesse McCartney Reps 'Young & Hungry' At People's Choice Awards 2015

Jesse McCartney keeps bow ties looking cool on the red carpet at the 2015 People’s Choice Awards held at the Nokia Theatre L.A. Live on Wednesday (January 7) in Los Angeles.

The 27-year-old musician kept close to his model girlfriend Katie Peterson as they arrived.

PHOTOS: Check out the latest pics of Jesse McCartney

“Great time tonight at the #PeoplesChoiceAwards with @katielaurapeterson. Thank you to all of the fans for your support over the years! Love you all! #RedCarpet #SaintLaurent #YoungAndHungry #Nominated,” Jesse captioned on Instagram.

10+ pics inside of Jesse McCartney and Katie Peterson

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Jesse McCartney Performs For The Unlikely Heroes At Gala Event

Jesse McCartney Performs For The Unlikely Heroes At Gala Event

Jesse McCartney hops on the stage for a special performance at the 2014 Unlikely Heroes’ Awards Dinner And Gala held at Sofitel Hotel on Saturday night (November 8) in Los Angeles.

The 27-year-old singer arrived at the gala event with girlfriend Katie Peterson, where they honored internationally known abolitionists for their outstanding efforts to end modern-day slavery with Selena Gomez, Austin North and more.

Unlikely Heroes, which provides safe housing, medical care, trauma therapy, education, life skills, and job training to children rescued out of sex slavery worldwide, honored Rebecca Vanyo, Nicolas and Mel Acuña, Richard Braun, Bonnie Abaunza, Leah Albright-Byrd, Justin Dillon, actress Serinda Swan and Carissa Phelps.

15+ pics inside of Jesse McCartney and Katie Peterson

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Jesse McCartney & Katie Peterson: MusiCares Couple!

Jesse McCartney & Katie Peterson: MusiCares Couple!

Jesse McCartney looks dapper as he arrives 2014 MusiCares Person Of The Year Honoring Carole King event held at the Los Angeles Convention Center on Friday night (January 24) in Los Angeles.

The 26-year-old musician was joined by his longtime girlfriend, Katie Peterson.

PHOTOS: Check out the latest pics of Jesse McCartney

Just last month, Jesse bundled up for a post-Christmas dinner at Boa restaurant.

“The song writing process in a nut shell…” the singer recently captioned a photo on Twitter that reads: I could agree with you, but then we’d both be wrong.

10+ pictures inside of Jesse McCartney and Katie PetersonMore Here! »

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Jesse McCartney & Katie Peterson: Sunset Couple!

Jesse McCartney & Katie Peterson: Sunset Couple!

Jesse McCartney stops to smirk for the camera as he heads out of a party held at the Sunset Towers on Wednesday night (November 13) in Los Angeles.

The 26-year-old musician was joined by his longtime girlfriend Katie Peterson.

PHOTOS: Check out the latest pics of Jesse McCartney

“Help those with loved ones in the Philippines get critical updates! Follow @philredcross #redcross,” he recently tweeted.

Earlier in the week, Jesse was spotted grabbing up a cup of coffee from Starbucks while out and about in Beverly Hills.

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Jesse McCartney & Katie Peterson: City of Hope Spirit of Life Gala 2013

Jesse McCartney & Katie Peterson: City of Hope Spirit of Life Gala 2013

Jesse McCartney and girlfriend Katie Peterson arrive at the 2013 City Of Hope Spirit Of Life Gala at Hercules Campus on Thursday night (September 19) in Playa Vista, Calif.

This year’s event honored CAA Head of Music and Managing Partner, Rob Light.

PHOTOS: Check out the latest pics of Jesse McCartney

“I love when I jump in the car and hear #BackTogether on @SiriusXMHits1. Thanks for voting and keep it up!!” Jesse recently wrote on Twitter about hearing his new track.

HAVE YOU bought Jesse’s new song yet?

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Jesse McCartney & Katie Peterson Juice Up

Jesse McCartney & Katie Peterson Juice Up

Jesse McCartney and girlfriend Katie Peterson stop by Bristol Farms for a healthy drink in Los Angeles on Monday afternoon (June 17).

The 26-year-old actor just wrapped up his first season on Lifetime’s Army Wives as Private Truman.

“There’s a pivotal scene where I’m in one of the towers, and I pick up a machine gun, and I end up firing at the enemy and ultimately end up saving this platoon,” Jesse dished about the season finale, which aired earlier this month. “But when I come home, something terrible happens to Tim, and he can’t get over it, and he suffers from posttraumatic stress disorder which is something a lot of our soldiers go through.”

He added, “[It] made you think about what these people actually go through and what they actually give.”

10+ pics inside… More Here! »

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