Ryan Gosling sent Greta Gerwig a 'Barbie' flash mob for her birthday

• Ryan Gosling sent Greta Gerwig a Barbie flash mob for her 40th birthday on Friday. 
• A group of dancers dressed in pink danced to songs from the "Barbie" movie for her. 
• Gosling previously sent a Scottish bagpiper to the "Barbie" cast sleepover during filming.

Greta Gerwig got a Barbie-themed surprise from Ken himself for her 40th birthday on Friday.

Two days before her movie officially made a billion dollars at the global box office, Ryan Gosling sent the "Barbie" director a Barbie flash mob to celebrate the milestone birthday.

As seen on the movie's official Instagram account, a group of dancers (all wearing pink) surprised the "Lady Bird" writer by acting like dolls and then breaking into a choreographed dance to songs from the movie. A giddy Gerwig looked on in amusement.

"As Kens know…. Sometimes the only way to express your feelings is through song & dance," a caption accompanying the video read. "Ken Ryan sent these special Barbies and Kens to start Greta's birthday with all the feelings!!"

After the performance, as Gerwig was hugging and greeting the dancers, someone off-camera told her to "guess who planned this" and told her to "think of the bagpiper."

The woman was referring to the surprise Gosling had previously orchestrated for the Barbies-only sleepover that Gerwig threw for all of the cast members who played a Barbie doll in the movie. Actors who played Kens were invited to stop by but weren't allowed to sleep over.

While Gosling couldn't make an appearance at the event, the "La La Land" star sent over a bagpiper with a specific message for his female cast members.

"This Scottish man, in a full kilt, showed up and played the bagpipes," Gerwig recalled in GQ of Gosling's bagpiper. "And then he read a speech from 'Braveheart.' And then he left."

"Barbie" is in theaters now.