Singer Britney Spears's new beau, Charlie Ebersol, personally designed and decorated the "Toxic" hitmaker's birthday cake.

Spears turned 33 Tuesday and enjoyed the special day with family, friends and the cake.

"Charlie wanted to specifically design this (the cake) for her from him. Every detail came straight from his creative, sweet brain," a source told eonline.com.

Made inside the do-it-yourself cake decorating studio at Duff's Cakemix here, the dessert featured Duff Goldman's famous confetti cake mix and a whole lot of love from its creator.

"Charlie is a sweetheart. He put a lot of time and thought into this. You can see from the pictures Britney sent out that the colors were pinks and golds and blacks. It was all his creation," the source added.

As it turns out, the birthday cake was the icing on an already perfect day.

"Thx for all the wonderful birthday wishes today, everyone! And of course thank u to these 2 cuties for theirs," Britney tweeted as her sons wrote "Happy Birthday" in the sand.