Nick Jonas Delta Goodrem couple dating rose red dress creme beige suit hankerchief mother son dinner family Denise Jonas Frankie Jonas

Looks like their age difference isn't keeping Nick Jonas, 18, from getting serious with girlfriend Delta Goodrem, 26!

First, the two took a tropical trip together, now she's meeting the family!

Nick took Delta to Villa Blanca restaurant in Beverly Hills Tuesday night (the celeb hotspot owned by The Real Housewives of Beverly Hills' Lisa Vanderpump) for dinner where his mom, Denise, was celebrating her 45th birthday. Nick's younger brother, Frankie, aka The Bonus Jonas, was also there.

The two were first spotted out together in mid-May.

Nick was a total gentleman with Delta; he bought her a rose and helped her into their car first. Love it!

See a pic of Denise and Frankie at the restaurant after the jump and all the pics in our gallery below!