Tori Spelling may have had everyone abuzz about her post-baby figure at the Byron & Tracey Salon opening party in Beverly Hills on January 29, but the mother of two was all baby talk. "Today she said 'Mama' for the first time," Tori told In Touch, referring to 7-month-old daughter Stella. "We were in the living room and I heard, 'Mama,' and I was like, 'Oh my God!' My heart melted." The 35-year-old actress is back to work on the set of 90210. "It's been really fun," said Tori. "I was really nervous the first day, but halfway through I was like, 'Wow, this feels … comfortable.' " Although, she admits, there has been one hiccup. "I was the youngest in the cast and now I'm one of the oldest," she explained. "Jennie [Garth] told me not to say 'older.' We're supposed to say, 'one of the originals.' "