U.S. actress Jennifer Aniston told "The Oprah Winfrey Show" Monday she has not had breast augmentation or ended her romance with actor Vince Vaughn.

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Aniston has never publicly addressed her relationship with Vaughn that began while the co-stars were in Chicago filming "The Break-Up," TMZ.com noted.

However, in response to Winfrey's question, "Are you broken up?" Aniston responded, "Oh no, no."

On the same day, Vaughn issued a statement from London threatening to sue U.S. and London tabloids for reporting he had cheated on Aniston with a mystery woman.

"Ms. Aniston and Mr. Vaughn had not ended their relationship either at the material time or since," the statement from Vaughn said, adding reports of him passionately embracing a "mystery woman" were false.

Aniston also told Winfrey she had not surgically enhanced her bust, but admitted to gaining 10 pounds with a "couple cheese plates too many."