Jessica Graf and Cody Nickson have won Season 30 of "The Amazing Race," taking home the grand prize of $1 million.

The "Big Brother" houseguests, a recently engaged couple known as Team Big Brother, were crowned the winners Wednesday after beating out Alex Rossi and Conor Daly of Team Indy Car, Henry Zhang and Evan Lynyaka of Team Yale and Kristi Leskinen and Jen Hudak of Team Extreme.

The season finale featured challenges such as kayaking outside Giants stadium in San Francisco, climbing up the side of a giant building, baking two trays of fortune cookies inside a factory and finding and putting together 12 parts of an airplane that were scattered across aircraft carrier the USS Hornet.

Graf was able to assemble the plane parts first giving herself and Nickson the victory. Team Yale came in second with Team Extreme in third.

"He promised to make the half a million dollars we lost on #BigBrother. He doubled his promise," Graf said on Instagram in reference to the $1 million cash prize alongside a photo of herself kissing Nickson while being held in his arms.

The pair first met during Season 19 of "Big Brother" in 2017 before they joined "The Amazing Race" in September.

Nickson proposed to Graf by surprising her during a hike up Runyon Canyon in Los Angeles where he got down on one knee at the top of the hill.