Los Angeles, CA -- Lindsay Lohan puts whipped cream on her morning cereal. The "Mean Girls" actress is such a fan of the fattening dairy treat she can't bare to have a meal without it, and even slathers it over her breakfast.

A source said: "Lohan shared this personal food fact - she loves whipped cream so much, she even puts it on her oatmeal in the morning."

The 23-year-old actress let her guilty food secret slip while out celebrating her on/off girlfriend Samantha Ronson's 32nd birthday on Friday.

Samantha was due to DJ at Chicago's Hotel Sax's Crimson Lounge, and was amazed when Lindsay and her younger sister Ali Lohan flew to the U.S. city to surprise her on her special day.

The trio and a group of friends ate dinner at eatery Hub 51, where they munched chicken and steak tacos followed by carrot cake.

Lindsay - who has completed three stints in rehab - and Samantha frequently went outside to smoke cigarettes, prompting an onlooker to chastise her.

Lindsay replied: "This is far from the worst thing I've ever done to my body!"

The group then went to watch Samantha perform, after which they moved on to nightspot Angels and Kings.

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