Former Friends star Courteney announced her happy news via Twitter on Thursday night (26 June), alongside a sweet image of herself and Snow Patrol's Johnny together.
She added the simple caption: "I'm engaged to him!"
Johnny then posted the exact same picture on his own Twitter account, writing: "I'm engaged to her!"
Courteney and Johnny's engagement news comes just a few months after they denied plans to marry. Courteney denied an engagement back in April while walking the red carpet at the Tribeca Film Festival in New York.
The brunette star – who became a household name as Monica Gellar in Friends - is believed to have met Johnny via mutual friend Ed Sheeran.
Ed had been staying at Courteney's beach house in California and working on new music with Northern Irishman Johnny.
Courteney and Johnny moved in together earlier this year, and have since made a handful of red carpet appearances together, taking their romance public.
This will be Courteney's second marriage. She was previously wed to Scream co-star David Arquette, the husband of her daughter Coco, ten.
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Stars who became engaged in 2014 in pictures:
Copyright: Instagram kayascods