Rob Mariano, Amber Mariano Rob Mariano, Amber Mariano

Survivor couple Rob and Amber Mariano are expecting their fourth child.

"My wife Amber is so hot, I can't keep my hands off her... Here is to 2014!!! #4," Mariano tweeted along with a sonogram.

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The pair, who met on Survivor: All-Stars in 2003, got engaged during the season's live finale when they were the last two competitors still fighting for the million-dollar prize (Amber won). The two wed in 2005. Rob won Survivor: Redemption Island in 2011 and the couple also competed together twice on The Amazing Race.

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The new baby will join the Mariano's three daughters: Lucia Rose, 4, Carina Rose, 3, and Elisabetta Rose, 20 months.