Nick Jonas, Delta Goodrem vacation in Bali

This one time, at songwriting camp...

It's getting serious between Nick Jonas, 18, and his Australian girlfriend Delta Goodrem, 26.

The couple, who stepped out in May holding hands, were spotted vacationing together in Bali, People reports. However, a source says it wasn't all fun in the sun as they were attending a songwriting camp. Yes, a songwriting camp.

Apart from their grueling camp schedule, Jonas and Goodrem found some time to relax as they were spotted dining at The Beach Club at Sandy Bay on Nusa Lembongan.

On Monday, June 6, Jonas tweeted, "I have been so blessed. So many great things happening!"

Previously, Jonas dated Miley Cyrus and Selena Gomez while Goodrem was engaged to Irish singer Brian McFadden.