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The blond actress went bowling with her beau Garrett Hedlund and a group of six friends at Pinz bowling center in Studio City earlier this week.
A source tells E! News that KiKi's birthday crew arrived around 8 p.m. and stayed for more than two hours.
"The whole group seemed like they had a really good time," our insider told us.
Dunst and Hedlund couldn't keep their hands off of one another throughout the birthday bash and showed off some major PDA in between their turns.
The close knit group of friends all sang "Happy Birthday" to the lady of the hour and enjoyed pizza during the low-key evening outing.