"When you throw a roller skating Bday party for your wife but you can't figure out how to wear your hat... #MakeAmericaSkateAgain," Timberlake captioned an Instagram video of himself rolling through the party in an amazing America-themed getup.
Biel, too, took to the social media app to share pics from the party, thanking Timberlake for helping her realize her "inner Zanadu."
"This is what birthday dreams are made of. Thank you, my love, for throwing me the most epic jam skate party ever. My inner Xanadu was fully realized," she wrote alongside the dreamy snap. "I love you to the moon and back. And then back again."