No, she is not. If she were then Michelle had Kiely at the age of 6. Kiely's real mother is casting director Kim Williams.
Kiley Williams is 7 years younger than Michelle Williams, but there are not related by anyway they just have the same last names. Ironically, Kiely does have a sister by the name of Michele...
110 lbs
Michelle Williams was born on July 23, 1980.