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Gayle King, Oprah Winfrey

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Gayle King has been more than honest about her weight loss journey with Weight Watchers, and now she's revealing she had a big cheat day.

The CBS This Morning anchor took to Instagram to share a joyous photo of her partying with BFF Oprah Winfrey, David Oyelowo and many more for her birthday. But you can't have a birthday without birthday cake! King showed off the gorgeous cake on the photo-sharing site and confessed to having cheated on her diet.

"can't celebrate birthday without THE CAKE! The official bd photo & special thank YOU to chef@montifrederic!," she captioned her picture. "Yellow w/bananas foster filling & layer of caramel .. Yep fell off @weightwatchers wagon..Back on track today!"

Sounds absolutely delicious! Birthday cake is a must-have, so we don't blame her at all for treating herself. Plus, she has been documenting her entire celebratory trip, which has included plenty of hiking. Obviously, she's working extra hard to enjoy that banana foster.

A photo posted by Gayle King (@gayleking) on

"Hiking this am w/ Urania Greene was told 30 min up & 30 min down.. 45 min in-I said how MUCH longer? Notice Mrs Greene has not broken a sweat ... Me hot mess!" she captioned the funny photo.

This isn't the first time the journalist has cheated on her diet with cake. She opened up to E! News' Marc Malkin at the opening of The Color Purple on Broadway and confessed she knows how to have her cake and eat it, too.

"This is the beauty of Weight Watchers—you can eat exactly what you want and I for one needed structure," King said at the time. "But what's great is you can eat whatever you want and you decide how you want to your points. The other day I had two pieces of cake!"

"I don't recommend that. I had salad the rest of the day, but then the next day you get right back on it," she said.

Watch the video to find out how Oprah got involved with Weight Watchers.