No other details regarding the proposal or whether the pair have set a wedding date were immediately reported.
The couple have been dating since 2008.
Cuthbert is best known for her work on TV's "Happy Endings" and "24."
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AUBURN HILLS, Mich., June 18 (UPI) --U.S. automaker Chrysler said Tuesday it would recall 2.7 million Jeeps after first snubbing regulators on the issue.