Melissa Gilbert is set to marry The West Wing star Timothy Busfield.

The couple became engaged over the Christmas (12) break and celebrated its impending nuptials during a lavish party at Los Angeles eatery Mr Chow on Monday (28Jan13), a representative confirmed to UsMagazine.com.

A source says, "They got engaged over the holidays. They've known each other for quite some time, as their paths have crossed off-and-on over the past 20 years".

It will be the third marriage for both TV veterans - the former Little House on the Prairie star and mother-of-two's exes include actor Bo Brinkman and Bruce Boxleitner, who she divorced in 2011.

Busfield, who has three children of his own, was previously wed to Radha Delmarter and Jenny Meriwin.