The new couple has been spotted around Park City together getting all kinds of cozy and packing on the PDA.
So just how public have the lovebirds gone?
Hedlund was on hand to support his lady at the premiere party for Dunst's new flick Bachelorette at Village at the Lift.
After the soiree, the 27-year-old Tron star and his gal arrived together at T-Mobile and Google Music's Tao nightclub around 12:30 a.m., where they partied the night away with celeb pals like Rashida Jones and James Marsden.
"They were acting really coupley all night, sitting next to each other, kissing and making out," a source tells us of the hot and heavy duo, who costar in the upcoming Kristen Stewart film On the Road.
According to our source, the 29-year-old actress and her beau spent most of the night getting their PDA on at a private table with friends. They also hung out on stage, dancing alongside Samantha Ronson who was deejaying throughout the bash, but avoided taking any photos together.
They left together a little after 1:30 in the morning.
A rep for Hedlund declined to comment. Dunst's rep did not immediately comment.
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