The Do You Think I’m Sexy chart topper conducted the draw alongside SFA President Alan Mcrae and former Hibernian manager Alan Stubbs.
But the 72-year-old's over-the-top gestures caught viewers attention as he shouted out the numbers and seemed very enthusiastic.
He smiled mischievously throughout and certainly amused viewers with his excitable antics as he took part in the fifth-round draw.
When he reached in to get a ball, the musician lifted his arm up high and scooped into the pot in a very dramatic move.
Rod Stewart's over-the-top gestures when selecting a ball, certainly made viewers giggle
Rod Stewarts' behaviour during the Scottish Cup Draw amused viewers
His flamboyant attire – a dapper green blazer and leopard print scarf – added to his eccentric performance.
Rod’s behaviour seemed to have got the manager a little distracted as he accidentally got a six and a nine mixed up.
The Celtic supporter made a huge cheer when he found out he had given Brendan Rodgers side a home draw against Inverness Caledonian Thistle.
The television draw concluded with Rod ignoring a handshake from the SFA President and instead gave a thumbs up to the camera.
At the end, the commentator even suggested the rock singer could get a job as a bingo caller.
Rod Stewart snubbed a hand-shake from Alan Mcrae for a thumbs up to the camera instead
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Sir Rod Stewart knighted at Buckingham Palace
Wed, October 12, 2016
The hitmaker received the honour for his services to music and charity from the Duke of Cambridge while supported by his wife Penny Lancaster as well as their two sons, Alastair, 10, and five-year-old Aiden.
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The rock singer is used to entertaining fans performing his hits on stage
The footage caused fans to go wild as they flocked to social media to praise his bizarre antics calling him a “legend”.
One person wrote on Twitter: “I’ve watched the clip of #RodStewart drawing the balls at the #ScottishCup about 50 times and cried with laughter every time, amazing.”
“@rodstewart what a legend hilarious tonight doing the draw,” said another.
A third posted: “If you haven't seen rod Stewart doing the Scottish cup draw today you are missing out #scooooop.”
“We should just let rod Stewart do the @EmiratesFACup & @EFLCup draws,” noted one fan.