Ian Somerhalder, who stars as Damon Salvatore on The Vampire Diaries, has already spent time in Hawaii this week, filming scenes for season six of Lost.

But it looks like Somerhalder isn't the only actor with a new gig that is reprising a role on the final season of the ABC hit.

According to TV Guide Magazine, both Katey Sagal (pictured) and Julie Bowen will appear in an at least one future episode. The former portrayed John Locke's girlfriend, Helen, and is now starring on Sons of Anarchy.

Bowen - who is set to appear on ABC's Modern Family - already has thoughts on how her character of Jack's ex-wife might fit into Lost. She said:

"The last time you saw Sarah, she was pregnant with another man's child. But I would pitch that it was actually Jack's baby and Jack's found out and it's somehow important to whatever is happening on the island."

Not a bad theory. Viewers won't find out for sure until early 2010.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.