It's been a week full of rumors for actress/singer Miley Cyrus and her beau Liam Hemsworth. The tabloids first began to lay into the newly engaged couple with pregnancy rumors and now cheating rumors. But Miley is putting a quick end to the tall tales, denying the allegations on Twitter.

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Miley is shooting down rumors that she is cheating on Liam with Cheyne Thomas, the mystery man she was snapped taking a dip in a Miami pool with earlier this week, calling them "bulls**t." However, it wasn't Miley who went on the defensive first.... Her mom Tish hit up the popular social media site first, defending her daughter. In regards to the pregnancy rumors, Tish tweeted, "So sad that the nasty tabloids have to make up stories to sell their trashy mags. Can't they just leave these 2 alone and let them be happy? This should be the happiest time of [their] lives and it makes me sick they USE her to sell mags."

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Defending herself, Miley tweeted, "So now because I am engaged I can't have a friend of the opposite sex? can't have a friend help me out while I'm working allll day?#dumb." Adding, "Maybe YOU would have friends too if you'd get your face out the tabloids & start living your own life :) unfortunate."

And Miley didn't stop there, the soon-to-be Mrs. Hemsworth tweeted, "I love my fiance & he loves me. All the rest is bull sh--. We get to live a life of happiness no one can take that away from us!"

First pregnancy and then cheating.... what will Miley be faced with next?

Photos courtesy of Fame/Flynet