Kaley Cuoco and The Flight Attendant costar Zosia Mamet reveal matching 'boop' tattoos

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They are costars and roommates.And if that already wasn't close enough, Kaley Cuoco and Zosia Mamet are bonded through ink for life twice over.The two stars of The Flight Attendant got their second set of matching tattoos which they proudly showed off on Instagram Tuesday.Scroll down for video Bonded for life: Kaley Cuoco (left) and Zosia Mametgot their second set of matching tattoos which they proudly showed off on Instagram TuesdayKaley, 36, took to Instagram to share a gallery of snaps of she and 34-year-old Zosia with their fresh ink by tattoo artist Arbel Nagar which read 'boop' along their inner-bicep.

She captioned the image to her 7.3million followers: 'I "booped" you many years ago @zosiamamet . Glad we made it official. Thank you @ar.bel for the perfection [black heart, white heart emojis]'The two cuddled up for several snaps together as they happily showed off their fresh ink.

Sweet:Kaley, 36, took to Instagram to share a gallery of snaps of she and 34-year-old Zosia with their fresh ink which read 'boop' along their inner-bicep She captioned the image to her 7.3million followers: 'I "booped" you many years ago @zosiamamet .

Glad we made it official. Thank you @ar.bel for the perfection [black heart, white heart emojis]' Though it may be an inside joke, UrbanDictionarydefines boop as: 'Affectionately poking someone on the nose, often accompanied by saying "Boop!"'Last week the two thespians were spottedleaving a tattoo parlor in the San Fernando Valley on Wednesday, after getting the brand new body art on their arms.The Flight Attendant co-stars - who are also roommates - appeared thrilled with their ink as they continued admiring the new designs on their arms.