Hayden Panettiere Hayden Panettiere

Hayden Panettiere turned heads at ABC's Upfront party Tuesday, and it wasn't just because of her curve-hugging purple dress.

The Nashville star, 23, was seen wearing what some are speculating to be an engagement ring from her boyfriend, Ukrainian boxer Wladimir Klitschko.

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Panettiere was spotted wearing the ring in question on her right hand instead of the traditional left hand, but it was quite a sparkler. According to People, the ring features what appear to be several rows of diamonds in a rounded, thick platinum setting. (Coincidentally on Nashville, Panettiere's character, Juliette, was burned last week when she learned her now-ex-boyfriend, Dante (Jay Hernandez), stole money from her to buy a ring for another woman).

Rumors that the Heroes alum was engaged to Klitschko first started in April.