Demi Lovato, Wilmer Valderrama

If Demi Lovato doesn't feel the need to give her heart a break, so be it.

Now that we know her dinner with One Direction's Niall Horan wasn't more than a friendly hangout, there's no reason to doubt that she's dating old flame Wilmer Valderrama again.

Approximately two years after their first go-round fizzled into friendship, the cozy-looking duo were spotted having dinner at El Torito in Sherman Oaks, Calif., on Sunday night.

After yet another sojourn into couplehood late last year, Lovato and Valderrama appeared to be back on earlier this summer when they teamed up to shoot a PSA for Voto Latino.

A source tells E! News that Lovato celebrated her 20th birthday with the 32-year-old That '70s Show star last month and they definitely are dating.

Well, the tweet Valderramra sent Lovato's way for her birthday certainly didn't do anything to dispel the notion.

"Feliz Cumpleaños to my angel @ddlovato, U continue 2 make me proud," he wrote. "U are the hero this generation it's been waiting 4! With & by you always."

Nothing not super-sweet about this, is there?

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