Couples

Jessica Simpson & Tony Romo's Double Date

By Mary Margaret and Kate Stroup

03/03/2008 at 09:45 AM EST

Double your pleasure, double your fun.

Jessica Simpson and boyfriend Tony Romo enjoyed a fun-filled double-date with CaCee Cobb and Donald Faison Saturday night.

First, the foursome headed to L.A. hotspot Villa, where they asked the DJ to play a few choice tunes. "They requested really fun, 'Sweet Home Alabama'-type things that everybody knows," says a fellow clubgoer. "They were singing and dancing on the banquettes, really high energy."

But Simpson and the Dallas-based NFL quarterback – who have been dating since fall – did manage a few private moments.

"Jess and Tony were really affectionate, hugging and kissing," said the witness. "They're really sweet with each other."

Afterward, they parted ways with Simpson's former assistant and her Scrubs-star beau – who has called Romo a "great guy" – and headed to Teddy's.

Simpson and Romo, both 27, looked "insanely happy together," said an onlooker. "Lots of laughing and cuddling up."

The two certainly do seem serious, said one pal. "Tony loves that girl."