Kelly Brook’s mum has said her daughter is "unbelievably happy” that she is pregnant with her first baby, and she herself is “thrilled” that she's going to be a gran.Sandra Parsons admitted that she has known since Christmas, when stunning model Kelly called her up with the good news.“We’ve known for a long time. Kelly phoned from America just before Christmas. She was "unbelievably happy,” Sandra told The Mirror, adding: “It’s lovely, we are thrilled.”Kelly confirmed that she is pregnant with a little girl on Wednesday via Twitter, after being spotted shopping in LA, sporting a bump which was peeking out from under her top.She later tweeted: “Thom and I are happy to announce we are expecting a baby girl. We are delighted XXXXX” [sic].