There are plenty of celebrity siblings you probably don't know about [1], and the Hemsworths gave us another surprise on Saturday Night Live [2] over the weekend. To support Chris Hemsworth's debut as host, the show called in the famous family of People's sexiest man alive [3]. Not only was Liam Hemsworth there, but his brothers Luke and Callum Hemsworth were also on hand. If you've never heard of Callum before, watch the video, above, to make sense of it all.