The 'Toxic' singer celebrated turning 33 on Tuesday (02.12.14) with an enormous sweet treat, lovingly designed by her new beau at the cake decorating studio Duff's Cakemix in Los Angeles.
A source shared: ''Charlie has been a longtime client of Duff's Cakemix and he wanted to specifically design this for her from him.
''Every detail came straight from his creative, sweet brain.''
Despite having only dated for a couple of months, the 31-year-old producer proved how well he knows Britney by perfectly co-ordinating the cake to the rest of Britney's decor.
The source told E! News: ''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 colours were pinks and golds and blacks. It was all his creation.''
It seems as though Britney was pleasantly surprised with the confection as she tweeted a photo of herself blowing out the candles on top of her lavish cake, along with the caption: ''Couldn't have wished for a better birthday yesterday... Hello, 33! #Club33 (sic)''
She also thanked her fans and her two boys - eight-year-old Jayden and Preston, nine, from her previous marriage to Kevin Federline - after she shared an adorable photo of them on Twitter.
She wrote: ''Thx for all the wonderful birthday wishes today, everyone! And of course thank u to these 2 cuties for theirs (sic)''
Britney started dating Charlie in October, just two months after she split from her long-term partner David Lucado.
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