Things are getting pretty serious and heated up between Nick Jonas and Olivia Culpo. After having spent a few days apart, the "Nolivia" couple made quite the romantic come back at the US Open. The Jonas Brother youngest member showed off his slick moves in romancing his "Miss Universe."

Aside from the action at the US Open, onlookers had been viewers to some other "side action" and affection. The Jonas Brothers, Nick Jonas and Joe Jonas brought their beautiful girlfriends along to watch the US Open.

While Joe and Blanda were all focused on the game, Nick and Olivia only had eyes for each other. The "Nolivia" couple just couldn't get their hands and lips off each other at the tennis match set in USTA Billie Jean King National Tennis Centre, New York. Judging from Nick Jonas' tweet, it appears he still did manage to watch the game.

"US Open was so fun. Good people. Good tennis," stated Nick on his Twitter account.

As far as Olivia is concerned, the couple seem to be going steady and serious over the past couple of weeks. In fact, Nick Jonas had already met the parents of Olivia and they've got nothing but good words to say about Nick. Does this mean Nick Jonas is officially over ex-girlfriend Miley Cyrus to which he dedicated the song, "Wedding Bells?"

Hopefully, Nick truly is happy with his new lady love. Fans of the "Nolivia" couple are praying that the youngest Jonas Brothers' member follow in Kevin Jonas' footsteps as well. With their intense PDA, could the "Nolivia's" relationship really push through to marriage?

Check out the slideshow to see more photos of Nick Jonas and Olivia Culpo at the US Open.

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