It's the latest charity nomination to go global since the 'no make-up selfie' and like before, celebs are going all out to give a little back.
Yesterday, it was Ashley's turn to throw ice cold water over her head after being nominated by her Hollywood pals, Vanessa Hudgens and Shenae Grimes-Beech, but not without getting her old buddy Zac in on the action too!
She might have been all smiles before her 'ice bucket challenge', but those smiles soon turned into squeals as Ashley's fiancé Christopher French was only too happy to pour the freezing water over his wife-to-be!
Catching her breath, Ashley cried "I nominate Zac Efron" and, almost like it was planned, the heart throb appears from nowhere saying "who me?" before he too is drenched by Christopher.
Despite being soaked through and no doubt a little chilly, Ashley and Zac were still in good spirits as they jumped up and down after their challenge.
Zac laughed as he said "that was way colder than I anticipated" before pulling his close pal in for a hug - cute.
The pair starred together in Disney's hit film High School Musical back in 2006 and the two sequels that followed.
But even though it's been 6 years since the High School Musical trilogy came to an end, it looks like Ashley and Zac are still the best of friends - even if she does nominate him to be covered in ice!
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