09/25/2010 AT 02:45 PM EDT
Eternally sun-kissed California girl Heather Locklear
turns 49 Saturday, but she got the party started early.
On Thursday, her boyfriend of more than three years, Jack Wagner, threw the Melrose Place
star an intimate dinner party at one of her favorite spots, Korean barbeque restaurant Woo Lae Oak, in Beverly Hills. As fellow diners looked on, the birthday girl opened gifts, gabbed with pals and got busy on the grill.
"Jack and Heather were cooking for all their friends. They were having so much fun," says an onlooker, who adds that Locklear looked "gorgeous . . . She was glowing."
After dinner, Locklear opened gifts and was presented with a chocolate molten lava cake. "All her friends sang to her. Jack harmonized and then sang the 'and many more' part," says the onlooker. "Heather was laughing all night."
The celebration capped a "laid-back, mellow summer," during which Locklear spent time hanging with Wagner and her daughter Ava, 12, says a pal.
Next up: She'll shoot the Lifetime original movie He Loves Me
, a psychological thriller
to air next year.
"She had a great, great summer and now she's really looking forward to starting on the movie," says the friend, adding that despite a sometimes-bumpy year
, Locklear is looking and feeling great.
Says the friend, "She's doing unbelievably well."