“Kate and Ned are delighted” the couple's rep said of the 37-year-old actress and her 34-year-old husband, who also happens to be Richard Branson's nephew.
Rocknroll works for Branson's space travel company, Virgin Galactic.
Winslet has two other children from her previous marriages to directors Jim Threapleton and Sam Mendes -- Mia Honey Threapleton and Joe Alfie Winslet Mendes -- according to The Hollywood Reporter.
Jessica Simpson shares three-way kiss with friends in photo
Dennis Rodman pledges to end trips to North Korea