Claire Danes turned 30 in April. (REUTERS)

Kate Hudson

Kate Hudson celebrated her 30th birthday in April. (REUTERS)

Jennifer Love Hewitt

Jennifer Love Hewitt turned 30 in February. (REUTERS)

Pink

Pink turned 30 in September. (REUTERS)

Pete Doherty

Pete Doherty turned 30 in March. (REUTERS)

Sophie Monk

Sophie Monk turns 30 in December. (REUTERS)

Adam Brody

Adam Brody will turn 30 in December. (REUTERS)