Lord Alan Sugar stepped away from his office to enter Piers' domain in the Good Morning Britain studio... and the pair ended up stepping on a pair of scales for an epic weigh-off!
Susanna was able to have a little rest and munch on her breakfast as the notorious nemeses went full throttle at each other when Britain's toughest boss came on the show to talk about The Apprentice.
Conversation (or should we say, a war of words) turned to whether Shuggsy helped launch Piers' television career or not and the question of whether Piers has yet been invited to the White House by his good friend, President Trump.
At least some good came of the pair's squabbling. They ended up setting up a wager on who can lose the most weight by December - with the loser donating £5,000 to Great Ormond's Street hospital.