US Weekly reports that over Labor Day weekend, the 18-year-old Jonas took the 26-year-old Aussie Goodrem on a trip to Los Cabos, Mexico, where the couple was seen on the beach being affectionate. As any couple probably would be.
On both Monday (Sept. 5) and Tuesday, Jonas took to Twitter to tease his fans, "I'm getting so excited about sharing my big news with all of you! Who thinks they know what it is? : )" and "Headed to the airport.... Who's ready for my big announcement tomorrow?.."

So look for Jonas' big announcement sometime Wednesday. Many are speculating he and Delta are engaged.
UPDATE: Nick made his big announcement and all you fans that were upset he was going to be officially off the market can breathe easy. He's not engaged. He's coming to Broadway next year. Nick tweets, "So excited & honored to play the role of J. Pierrepont Finch in How to Succeed in Business Without Really Trying next year!"

This means after "Glee's" Darren Criss replaces Daniel Radcliffe, presumably Nick Jonas will replace Darren Criss.