Andy Cohen's reaction is priceless when Susan Lucci surprises him on set of ...

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Andy Cohen is sitting in as guest co-host during the fourth hour of the Today show all week for co-host Jenna Bush Hager, who's out on maternity leave. 

During Tuesday's show, host Hoda Kotb put Cohen on the spot during a playful game, where he had to name a mystery guest who was standing behind a screen in the studio.

It turns out that mystery guest was one of his favorite celebrities of all time, and his excited reaction when her identity was finally revealed is priceless. 

Shocker! Soap icon Susan Lucci surprised Andy Cohen during a mystery guest segment during Tuesday's episode of the Today show

Shocker! Soap icon Susan Lucci surprised Andy Cohen during a mystery guest segment during Tuesday's episode of the Today show

'She's over there,' Kotb teased her co-host, while gesturing to the mystery guest's silhouette. 

Cohen appeared baffled and had no idea who this person could be. 

'Clue number one: This person competed in Dancing With The Stars,' Kotb said. 'Clue number two: This person has great genes; her mom's  102 [lbs]. And clue number three: you spent hours on the couch eating [mini donuts].

By the time she revealed the third clue about the donuts, Cohen jumped out of his chair and shouted out his guess over and over again.

'Is it Susan Lucci? Is it Susan Lucci? Is it Susan Lucci?' he asked as stared directly at the mystery guest's silhouette from behind a screen.

Anticipation: Cohen, who is serving as co-host all week, had to guess who his mystery guest was standing behind a screen in the Today studio

Anticipation: Cohen, who is serving as co-host all week, had to guess who his mystery guest was standing behind a screen in the Today studio

Teasers: Host Hoda Kotb gave Cohen three clues about his mystery guest

Teasers: Host Hoda Kotb gave Cohen three clues about his mystery guest

Stumped: Cohen seemed baffled and had no idea who this person could be

Stumped: Cohen seemed baffled and had no idea who this person could be

The longtime actress, best known for playing Erica Kane on All My Children for more than 40 years, then stepped out for her big reveal.

'I knew it,' Cohen said, 'I know this silhouette.'

'Did you

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