Delta Goodrem meets the entire Jonas family!

Nick Jonas and Delta Goodrem as they leave the restaurant.

Nick Jonas and Delta Goodrem's relationship has been taken to the next level. The Jonas brother, 18, took his Australian girlfriend, 26, to his mom's birthday party! Denise Jonas celebrated her birthday at LA restaurant Villa Blanca.

As seen on the photo, the couple left the restaurant hand in hand, and Delta had a red rose in her hand. Delta is a huge star in Australia and has plans to try and crack the American market as well. The couple was first linked to each other in May, after Delta and Brian McFadden broke off their seven-year relationship, and have spent time together on holiday in Bali.