The former One Tree Hill star quietly split from actress Dalton earlier this year (13), six years after proposing, but fans only learned of the separation in September (13), when he was rumoured to have moved on with Whelan.
Now Murray has finally confirmed the new relationship by sharing a photo of himself and the Aussie kissing via Twitter.com.
In the accompanying caption, he writes, "I am a lucky lucky man. Blessed 2 feel the way I do with @NickyWhelan! I hope each of u feels the same in ur world (sic)!"
Murray was previously married to his One Tree Hill co-star Sophia Bush. The union lasted just five months.