(Photo : Reuters)

Demi Lovato denies rumors of dating One Direction's Niall Horan and was spotted enjoying a dinner date with ex-flame Wilmer Valderrama.

Who is Demi Lovato is the question on everyone's mind. While rumors of her seeing One Direction's Niall Horan are still making the rounds, the singer turned actress was spotted enjoying a comfortable dinner date with ex-flame and "That 70's Show" actor Wilmer Valderrama.

Rumors about Lovato and Horan dating first began after Lovato admitted in an interview earlier this year she thinks Horan is "adorable." In June, Horan's band mates picked Lovato as his perfect match during a round of "Rapid Fire Romance" on ETalk. "Niall dreams dirty things!" Harry Styles teased. The rumors grew even stronger when the duo were spotted heading to Pink Taco after the MTV Video Music Awards to grab a bite, a source confirms to Us Weekly.

However, Lovato has been quick to rubbish all such rumors. "There is nothing going on. Niall's my friend," she told E! News Tuesday. And the singer went on to say, "I'm just focusing on my work right now, and that's pretty much that."

Lovato and her former flame Valderama, however, were photographed at El Torito in Sherman Oaks enjoying a cozy dinner date. The "From Prada to Nada" actor dated Lovato in 2010 and after the breakup the two remained friends. Rumors of the two reuniting made the rounds fter Lovato was released from a treatment facility (where she was treated for an eating disorder and cutting) in January 2011

"We were really just best friends, and to be honest I couldn't be more proud of her," Valderrama told Perez Hilton in March. "She's a great human being. I was very proud to be there for her when she needed me and she was there for me a number of times too."

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