Lovato posted on Twitter a sweet birthday message for Jonas, who turned 27 yesterday, and praised the singer.
"Happy birthday to one of my favorite people on the planet. Love you @joejonas.. Have the best birthday!!" Lovato wrote alongside an old photo of the duo.
The pair dated briefly in 2010. Lovato, 23, moved on and started seeing actor Wilmer Valderrama, the same year. She split from Valderrama, 36, earlier this year.
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