Katy Perry was a smoldering sensation in a new Instagram snap she posted Tuesday promoting American Idol.

In her latest snap she posed up a storm in a gleaming orange cocktail dress with a slit up the side allowing her to show off her knockout legs.

'Mama ain't here to play': Katy Perry was a smoldering sensation in a new Instagram snap she posted Tuesday promoting American Idol.

She and her co-judges Lionel Richie and Luke Bryan got together with the longtime host Ryan Seacrest to cut a cake marking the occasion.

In her new Instagram album promoting the season Katy included a picture of herself cozying up to Lionel, Luke and Ryan in front of the cake.

Happy birthday: She and her co-judges Lionel Richie and Luke Bryan got together with the longtime host Ryan Seacrest to cut a cake marking the occasion