Katy Perry: 'Pregnancy has affected my voice'

msn.com:

Katy Perry's pregnancy weight gain has forced her to change her singing voice by "a couple of keys".The Teenage Dream singer has been busy promoting her new album Smile, which will be released on Friday, and in an interview with The Associated Press, the 35-year-old, who is engaged to actor Orlando Bloom and close to giving birth to a baby girl, explained being pregnant has had a small effect on her famous vocals. "It's interesting having 45 extra pounds just kind of like sitting on you; 30 of that is just right here on my lung capacity," she told the publication. "It's not been too challenging, but I've definitely had to change a couple of keys.