Selena tweeted: "@ddlovato IM so grateful you were born. #nomatterwhat #forever #haveTHEbestbday"
Demi and Selena have definitely had their share of ups and downs over the years - and when Demi unfollowed Selena on Twitter last year, she explained it was because "people change and people grow apart."
Earlier this week, Demi started following Selena on Instagram, so many wondered if they had patched things up. Based on Sel's tweet, it sounds like they are "forever" friends "no matter what." Keep an eye out for Demi and Selena at this year's We Day event too - hopefully they'll reconnect IRL.
UPDATE: Demi responded to Selena today, first retweeting her tweet, then writing: "I'm glad you were born too...#nomatterwhat #forever" @ddlovato you're the best"
Like, the sweetest...right?
Happy birthday to the most bad ass chick I know @ddlovato you're the best— Nick Jonas (@nickjonas) August 21, 2015
Demi also got a b'day tweet from the Fifth Harmony ladies and a totally kick-a** present from Kelly Clarkson – a cover of Demi's "Cool For the Summer."
@ddlovato HAPPY BDAY!! you've been there for us since we were practically babies so here's to another amazing slayful year gorgeous 💖🎂— Fifth Harmony (@FifthHarmony) August 20, 2015
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Gallery | Demi Lovato Through the Years