Joe and Nick Jonas can't wait to be uncles.

The Jonas Brothers stars' older brother Kevin and his wife of three and a half years, Danielle, announced on Tuesday (09.07.13) that they are expecting their first child later this year, and his siblings are equally excited about the new arrival.

Joe, 23, wrote on Twitter: ''Can't explain how excited I am about this. I'm going to be an uncle! Congrats @kevinjonas & @daniellejonas!!''

He later shared a picture of an ultrasound of a baby drinking from a Starbucks cup, and wrote: ''So pumped to be an uncle.''

Nick, 20, also extended his well wishes online and tweeted: ''Can't wait to welcome the newest addition of the Jonas family. Congratulations to my bro.''

Kevin, 25, previously admitted he is nervous but excited about becoming a father.

He said: ''I was overjoyed. It's been the most exciting thing in my life so far. I'm excited and I'm nervous.''

The couple, who wed in December 2009, have frequently discussed their desire to start a family together on their E! reality show, 'Married to Jonas'.

Danielle, 26, previously said she was under pressure from her family to have a baby, saying: ''Having kids is a big question right now; it does come up a lot.''

Kevin added: ''We're at that [3-year] mark and people are like, 'All right guys, what's your plan? When are you going to have those grandkids?' I'm starting to feel that pressure a little bit.''