The 28-year-old star played bad boy Sean Slater in the BBC1 soap from 2006 to 2009 and will join the cast, including Anna Paquin and Stephen Moyer, on the steamy vampire show.
We take a look back at the soap stars who've made it to Hollywood - from Kylie Minogue to former Brookside star Anna Friel.
Ryan Kwanten played the hapless yet loveable lifeguard Vinny in Home and Away back in 1999. He currently stars as the hapless yet loveable Jason Stackhouse in HBO's True Blood.
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