The 40 year old, who shot to fame on longrunning soap opera EastEnders, decided to end her marriage to businessman Kevin Jenkins earlier this month, according to the Daily Mirror.
A source tells the publication: "It's really sad but they have decided to call it a day. Kevin has moved out, but the two of them are keeping it amicable for the sake of the kids, their main priority.
"Sadly being husband and wife is no longer an option. Danniella has been through so much and really turned things around, so it's a dreadful blow."
Westbrook has previously credited Jenkins with helping her overcome an addiction to cocaine, which ruined her TV career in the 1990s.
The pair married in December 2001 and share an 11-year-old daughter, Jody.