The Oscar-winning actress wed Ned Rocknroll in New York earlier this month. The private ceremony was attended by Winslet's two children as well as a few friends and family members, her representative said Thursday.
It is the third marriage for the 37-year-old Winslet, who won a Best Actress Oscar for her performance in the 2008 film "The Reader." She was previously married to film directors Jim Threapleton and Sam Mendes.
The 34-year-old Rocknroll, who was born Abel Smith, is a nephew of billionaire Virgin Group founder Richard Branson.
The couple had been engaged since last summer.
In August 2011, Winslet and her children were staying at Branson's house in the Caribbean when it caught fire during a tropical storm and burned down. Winslet carried Branson's 90-year-old mother to safety.
Branson was staying in another property on the island. No one was injured.