InstagramIt's war!
The Vampire Diaries alum Nina Dobrev, 27, and Orange Is the New Black actress Ruby Rose, 30, appeared to hit it off immediately while starting to film xXx: The Return of Xander Cage about two months ago.
They celebrated Rose's birthday together and goofed around on Easter.
And then came April Fools' Day.
Just before the holiday, Dobrev pranked Rose by pretending to attack her as she entered a trailer on the movie set. The latter actress uttered a series of expletives in response, as seen in a video both posted on their Instagram pages.
"Got her!" Dobrev says gleefully.
"Going to have to wash your mouth out with Soap Missy," she wrote.
"When your friend is an a--hole..." Rose wrote. "Also obviously she edited me to say those awful things and OBVIOUSLY I HAVE AN INNER SUPER BOGAN I thought I left behind.."
She later got her revenge: The actress filled Dobrev's trailer with 100 headshots and other photos of herself.
"When you go to say hi to @ninadobrev but she has 100 photos in her trailer of you and it's awkward because you're trying to be professional.. #seekhelpnina #evillaughofastalker #wherestheshinetoo #ineedextrasecurity," Rose wrote.
Dobrev seemed thoroughly amused, laughing as she made the discovery after walking inside with a couple of coffee cups.
"Over here just trying to make some goddamn tea," the actress says in a video showing her opening the door to a microwave, with a Rose photo getting in the way.
"After I scared the crap out of her last week, she retaliated back," Dobrev wrote. "In true Narcissist fashion. By covering my entire trailer with photos of herself. Stay tuned y'all. The war has begun... #ScareWars Watch your back Rose... Watch your back. @rubyrose #XXXtheMovie."
Rose also posted another expletive-filled clip showing the full extent of the "damage," including photos of herself plastered all over Dobrev's trailer's bathroom, as Radiohead's "Creep" plays.
"@ninadobrev trailer... Wow.. This must be her head every night when she falls asleep." she joked.
"RUBY!!!! Hahah the music is a nice touch," Dobrev replied. "Oh, it's on. Get ready #TeamDobrev ... About to wreak havoc on @rubyrose #ScareWars."
xXx: The Return of Xander Cage is the second sequel to the hit 2002 movie and the second film in the series to star main actor Vin Diesel, 48, who reprises his role as the title hero, an extreme sports-loving super spy. The movie is set for release on Jan. 20, 2017.