"Jessica was very social, making the rounds and talking to everyone," the observer tells Us Weekly. Naturally, the expectant star and Weight Watchers spokeswoman "completely avoided the bar area."
But the mother to baby daughter Maxwell, 7 months, "wasn't shy about eating," the witness adds. "She reached out to the servers and was sampling everything that came by. She seemed to really like the chicken wings and had a few. Then she went for the fried risotto balls."
With her fiance Eric Johnson nearby, the former Dukes of Hazzard star had a drama-free reunion with her father, Joe, who arrived at the bash with her sister Ashlee. "After the ceremony Joe came right up to Jessica and gave her a big hug," says the witness of the family patriarch, who announced his divorce from Jessica's mother Tina, back in September. "Jessica talked to him for awhile and there didn't seem to be any problems."
(A pal told Us that there was initially some tension between Jessica and her father following the end of his 35-year marriage to Tina.)
The singer also took some pains to disguise her expanding pregnancy curves, the witness says. "She held her bouquet of red flowers in front of her stomach most of the time," says the observer. "She seemed bigger in the belly, but her dress was loose enough that her pregnancy wasn't too obvious."