Their pooches took centre stage on the rolled out red carpet at St Luke's Church in London on Wednesday (9 April).
New dad Simon, who welcomed baby son Eric with partner Lauren Silverman on Valentine's Day, looked super proud as he brought along his two pet pooches Squiddly and Diddly, who were dressed in Union Jack jumpers!
Music mogul and X Factor boss Simon welcomed the adorable puppies to his household in October last year.
Alesha, 35, stunned in a white embellished crop top and knee-length skirt as she posed with her dog Prince and two guards at the grand entrance.
Comedian David proudly held his dog Bert in his arms, while Amanda strutted her stuff on the red carpet with her dog Rudie in a white cut-out jumpsuit.
Simon and David also appeared to be formally introducing their pets to one another too. All four judges then posed with their dogs for a final picture and it made for a very crowded red carpet!
The new series of BGT returns this weekend on Saturday (12 April) where the judges will be searching for Britain's next biggest star. Last year's series was won by dance shadow act Attraction.
Also this week, Guinness World Records announced that Got Talent is the world's most successful reality TV format ever.
The talent show has 59 different versions being made in 58 different territories, with two in Belgium.
"I am very proud that Got Talent is a home grown British show," said Simon. "We owe its success to a group of very talented producers all over the world who have made this happen. And, of course, amazing talent."
Britain's Got Talent, hosted by Ant and Dec, returns to our screens this weekend on Saturday 12 April at 7.15pm on ITV1.
Watch the BGT trailer below: