No, she doesn't. I asked her myself on Twitter and she said, "No, I don't have a stepdaughter, I'm 23." so she doesn't have a stepdaughter.
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Right now in the year of 2011 she is turning 25 years old and her birthday is on March 28th :)
she was 22 years old
Lady Gaga's mother, Cynthia Bissett Germanotta, was born in 1954. She is 56-years-old in 2010.
Lady Gaga is not pregnant. But, I'm sure you're old enough to know how she would've got pregnant if she was.
Madonna is 53 years (16 August, 1958) Lady Gaga is 26 years (28 March, 1986)