While celebs typically want to keep some personal things private, others don't mind spilling a few things about themselves here and there - like their breast sizes!

Kate Upton

23-year-old Kate Upton has probably one of the most sought-after breasts in Hollywood. Talking to The Sun, the 34D cup sized "Sports Illustrated" model admits, "I wish I had smaller boobs every day of my life as I would love to wear spaghetti tips braless and go for the smallest bikini designs."

Katy Perry

30-year-old Katy Perry wears a 32D cup size. Talking to GQ, the "Roar" singer reveals: "I lay on my back one night and looked down at my feet, and I prayed to God."

She continued, "I said, 'God, will you please let me have boobs so big that I can't see my feet when I'm lying down?' God answered my prayers. I had no clue they would fall into my armpits eventually."

Sofia Vergara

Back in 2013, the Colombian "Modern Family" star revealed her bra size to Vogue magazine: "I am 40 years old, I had a baby and I am a 32F boob."

Of course, Sofia Vergara had to add, "And they are still real. [...] When they are fake, you take the bra off and they are still there, perfect! Me - no."

Victoria Beckham

Sexy doesn't necessarily mean having huge boobs, and Victoria Beckham is the perfect example for that.

The 41-year-old fashion mogul and former "Spice Girls" member confirmed to Allure that she's a 34B size, after having her 34DD breast implants taken out: "I don't have them anymore. [...] I think I may have purchased them."

Pamela Anderson

The 48-year-old "Baywatch" beauty previously had her DD cup size reduced in 1999. Pamela Anderson probably regretted the decision, since she eventually had them restore it back to its original size.

Ariel Winter

Here's another "Modern Family" star, but boasting of a much younger age. 17-year-old Ariel Winter underwent breast reduction surgery earlier this year to have her 32F boobs reduced to a 34D.

Christina Aguilera

After the 34-year-old "The Voice" judge gave birth to her son Max in 2008, Christina Aguilera revealed her breast size to US Weekly. She notes that in spite losing 40 pounds, she actually grew into an E cup!

Tyra Banks

The 41-year-old former supermodel and "America's Next Top Model" host is proud of her 34DD breast size.

After losing 30 pounds back in 2009, Tyra Banks revealed on her eponymous talk show, "I feel good about my curves and my imperfections - my booty, my boobs, my thighs - I embrace it all."

Jessica Simpson

The 35-year-old fashion designer is also a DD. Her father Joe Simpson told GQ, "Jessica never tries to be sexy. She just is sexy."

It might be awkward for Jessica Simpson to have her father talking about her sex appeal, but hey - at least he's proud of his daughter!

Dolly Parton

The 69-year-old "I Will Always Love You" singer has a 40DD breast size. Fun fact: they're insured for $600,000!