Jessica Simpson's large breasts are 100% percent real, she says recent reports that she's ready to downsize her chest are 100% percent fake.

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"It's UDDERly not true!" Simpson wrote on her Twitter account Wednesday.

"Breast assured everyone!" her representative added.

The 31-year-old, who will serve as a judge on NBC's upcoming Fashion Star and previously starred in VH1's The Price of Beauty and MTV's Newlyweds reality series, insists she has nothing but confidence in how her assets look.  

"Been getting lots of questions about this alleged breast reduction...not to worry...I LOVE MY BOOBIES!! They aren't going anywhere!" Simpson wrote.