The couple also celebrated their ninth anniversary on Thursday.
Diane Kruger went all the way back to Joshua Jackson’s days as a Mighty Duck to find an adorable #TBT for the actor's 37th birthday on Thursday.
"Happy Birthday to this adorable towhead who became my handsome man!" Kruger wrote on the precious pic of Jackson in his hockey gear on the set of the beloved '90s hockey franchise.
NEWS: Secretly Married? Joshua Jackson Refers to Diane Kruger as 'My Wife'
"And happy 9 year Anniversary too ❤️," Kruger continued, writing a sweet message to her partner of nearly a decade. "You make me appreciate life so much more and I'm so happy you found me in this crazy world."
Jackson tweeted his thanks for birthday and anniversary wishes from the set of The Affair, where he is currently in production on the second season of the Showtime drama.
NEWS: Joshua Jackson: A 'Mighty Ducks 4' Should Happen
"My anniversary/birthday view," Jackson wrote on the pic. "Thanks for all the well wishes. Always appreciated."
WATCH: Diane Kruger, Tom Arnold and More Talk Second Chances at the Chrysalis Butterfly Ball