Heidi Montag Has A Terrible Nightmare And Rihanna Announces A New Single In Today's Tweet Dreams

Last night, "The Hills" star Heidi Montag had the shock of a lifetime when she woke up from a nightmare and thought she had not put her nose tape on. "Thank god it wasn't true!" she tweeted. But "American Pie" star and all-around joker Jason Biggs, who apparently is an avid follower of Heidi's tweets, shot back, "Would ur face have fallen off if it was true?" We're hoping she comes back at him later with a nice witty response!

Meanwhile, Rihanna announced to Ryan Seacrest that she has a new single on the way! "In less than 10 dayz ima send u sumn special, and ur gonna play it OVER and OVER, like I'm the only girl in the world!" she tweeted. "Sweet can't wait!" he replied. "Jersey Shore's" Michael "The Situation" Sorrentino also had a big announcement to share: He is officially joining "Dancing with the Stars"!

Check out the best of the rest of Tuesday's celebrity tweets, including Lo Bosworth's obsession of the week and Kellan Lutz sharing pictures of his St. Bernard charity. Follow us @hollywoodcrush to get even more celebrity and pop culture news around the clock!

@katyperry Had an AMAZING day in Paris! First NRJ fun then lunch on TOP of the Eiffel Tower and then to finish it off, of course, Colette! #treschic!

-Katy Perry, Musician

@michaelwelchact Do you have 6 fingers? If you do, #littleknownfactaboutme, my name is Inigo Montoya. You killed my father. Prepare to die!

Mike Welch, Actor ("The Twilight Saga: Eclipse")

@ashleytisdale In the pouring rain filming a scene. Hot chocolate anyone?

-Ashley Tisdale, Singer, Actress ("High School Musical 3")

@kellanlutz Group Pic from working on a house with the St Bernard Project and an amazing group from AmeriCorps from Wash. DC http://twitpic.com/2jzf29

-Kellan Lutz, Actor ("The Twilight Saga: Eclipse")

@diablocody I think my son is an emotional eater.

-Diablo Cody, Screenwriter

@joelmchale @jimmyfallon I'm still doing dance moves & dreaming Born 2 Run. Can u guard my dreams & visions & ride in suicide machines w/me this wkend?

-Joel McHale, Actor ("Community)

@tomfelton i kinda sorta wish it was lunchtime, or even 12.01

-Tom Felton, Actor ("Harry Potter and the Half-Blood Prince")

@lobosworth want to exchange friendship bracelets? MY obsession of the week: http://bit.ly/aSqIdL super fun!

-Lo Bosworth, Reality Television Star ("The Hills")

@joejonas It really is... "hot" in Cleveland. ????????

-Joe Jonas, Musician

@kimkardashian Just left MTV VMA rehearsal! This is going to be funny!

-Kim Kardashian, Reality Television Star ("Keeping Up With the Kardashians")