'Back-Up Plan' Opens And A New Cast Member Joins 'Something Borrowed' In Today's Tweet Dreams

To promote her latest rom-com "The Back-Up Plan," Jennifer Lopez decided to play a little dress up. J. Lo channeled the iconic Marilyn Monroe as a birthday gift to George Lopez. The talk show host couldn't have been happier, posting, "check out @jlo ‘s amazing birthday gift for me. http://su.pr/2s3aJz." While Jennifer was busy promoting, co-star Michaela Watkins worried she may be the one to take the fall if the movie doesn't do well, urging her followers, "What if they dubbed me 'the box office killer' even tho it's my first movie? That would be rude. see #thebackupplan."

While the fate of "The Back-Up Plan" lies in the hands of moviegoers this weekend, one romantic comedy that's already got in a built-in fan base had a big announcement of its own. The upcoming film "Something Borrowed" based on the chick lit book of the same, which already has Kate Hudson and Ginnifer Goodwin among others on board, got a brand new addition today. The book's author Emily Giffin tweeted to fans, "STEVE HOWEY as Marcus!! http://bit.ly/c9g7De." Steve (pictured), who also starred with Kate in "Bride Wars," will play Ginnifer's friend and quasi-love interest.

Keep reading for the rest of Friday's best celebrity tweets, including an "Eclipse" star's opinion of the new trailer! Follow us @hollywoodcrush to get even more celebrity and pop culture news around the clock!

@joejonas Last night I lay in bed looking up at the stars in the sky and I thought to myself, where the heck is the ceiling.
-Joe Jonas, Musician

@ashbenzo Morning...have some fun scenes to shoot today...exciting
-Ashley Benson, Actress ("Pretty Little Liars," "Eastwick")

@hughhefner We're shooting the start of a new episode of "Girls Next Door" at the Playmate House today.
-Hugh Hefner, Reality Star ("Girls Next Door")

@lindsaylohan i love melrose place, why i am hearing it's not coming back next season? please say it isn't so!
-Lindsay Lohan, Actress ("Mean Girls," "Freaky Friday")

@zacharylevi Finally caught up on Lost. Wow.
-Zachary Levi, Actor ("Chuck")

@tinselkorey So how awesome did the Eclipse trailer look? Gangsta right? I only wish Emily had a fight scene w/ deadly muffins against newbadvamps. lol.
-Tinsel Korey, Actress ("New Moon," "Eclipse")

@jon_favreau Taping a greeting to London at junket http://twitpic.com/1htw6s
-Jon Favreau, Actor, Director ("Iron Man 2")

@ryanseacrest Happy to announce that I'm IN "Shrek Forever After"!
-Ryan Seacrest, Radio and TV Personality ("American Idol")

@chriscolfer I'll be on @TheEllenShow this Thursday!!! Excitement is too less of a word to explain how I feel!!!
-Chris Colfer, Actor ("Glee")

@torianddean Where have you been all my day twitter? Feels odd to realize its midday and I haven't tweeted all day. Happy Friday!
-Tori Spelling, Actress, Reality Star ("Tori and Dean: Home Sweet Hollywood")

Tags Emily Giffin, George Lopez, Jennifer Lopez, Something Borrowed, Steve Howey, Tweet Dreams, Twitter