Some Hollywood couples like to vacation together and ring in the holidays with each other.
Ryan Reynolds and Blake Lively recently supported friends Emily Blunt and John Krasinski at the premiere of their movie "A Quiet Place." Other couples like Elsa Pataky and Chris Hemsworth and Matt Damon and Luciana Barroso have been friends for years.
Here are nine sets of celebrity couples you might not know were friends.
Blake Lively and Ryan Reynolds and Emily Blunt and John Krasinski regularly have double dates.

Lively and Blunt are friends separately, and the two went to Michael Kors' fall-winter 2018 fashion show together in February. But the friendship extends to their spouses as well. Reynolds and Lively showed up to the premiere of Krasinski and Blunt's "A Quiet Place" to support the couple's latest movie. This was their second time spotted out together in recent weeks.
After seeing the movie, Reynolds called Blunt and Krasinski his "new parents" in a hilarious social media exchange with Krasinski.
Emily Blunt and John Krasinski like to pull pranks on Jimmy Kimmel and Molly McNearney.

As neighbors, a prank war erupted years ago between the two couples around Christmas. On a 2014 episode of "Jimmy Kimmel Live," Kimmel explained that the pranks had started three years prior after Blunt and Krasinski broke into his and McNearney's home to put up some light-up decorations. The pranks have hilariously escalated through the years.
Blake Shelton and Gwen Stefani and Brandon Blackstock and Kelly Clarkson regularly hang out.

Blackstock, a music manager, actually manages Blake Shelton, so the two couples are now close. Clarkson told "E! News" that the couples double date.
"You know, we've already [double dated] at her house, which is magnificent," Clarkson said. "And [Stefani's] family was there. It's a real testament of how she's such an awesome girl — it's 'cause of her family. Her family was super rad and down to earth. They're really, really cool."
Clarkson also revealed that they have a group text.
"Gwen always starts this sweet, and positive text and Blake and I always take it somewhere else," she said. "Him and my husband have that boy humor going on."
See the rest of the story at Business Insider