Although the Nashville star, 25, has been mum about her pregnancy, while having freezing water dumped over her head by pal Derek Hough, she confirmed her happy news.
“Couldn’t figure out how to post it on @haydenpanettier twitter,” Hough posted via Instagram. “So I’m posting it for her.”
The clip features Panettiere saying: “I accept my ALS Challenge. I renominate Kacey Musgraves — you’re not getting out of this, [fiancé] Wladimir Klitschko, and my unborn child.”
In May, news broke that the actress and her fiancé, 38, were expecting their first child together.
In the last few weeks, the #IceBucketChallenge has literally soaked some celebrities, including Justin Timerlake, Nicole Richie, Jessica Alba, Gavin Rossdale, Mark Wahlberg and Jennifer Lopez, to name a few.