Demi Moore 1 of 11From domestic musings to bikini pics, Moore's Twitter feed provides gossip-hungry readers with a slice of life from your average celeb-mom-who-looks-25-years-younger-than-she-really-is.
Twitter Highlight: In 2009 a woman posted a message online saying she was going to commit suicide. Moore’s quick response to the woman’s threat triggered readers to reach out to the San Jose police department, who picked up the woman unharmed.
Britney Spears 2 of 11Expect lots of fan adoration, music video promos, and messages written in txt format here.
Twitter Highlight: There are lots, but our recent favorite is this opening tour night photo, which features Spears in what looks like an ice panty lingerie set.
Yoko Ono 3 of 11Ono uses her account primarily to wax poetic about day-to-day life — a refreshing change from those who turn their Twitter feeds into 140-character promo campaigns.
Twitter Highlight: Ono's got some sweetness to her sap. This past Father's Day, she posted, "John used to say ‘I love you’ every day. I didn't understand then, how lucky I was."
Mariah Carey 4 of 11The singer actually has a little soul in her Twitter account; she's been known to RT the occasional inspirational message from Reverend Run (formerly of Run DMC) and Joel Osteen ... along with posts on clothes and kids, of course.
Twitter Highlight: Carey revealed the initials of her new twins on Twitter then had fans guess the names. Guesses ranged from Maui to Marauder, which we’ll admit are worse than the actual ones she picked: Moroccan and Monroe.
PINK 5 of 11This pop anti-princess packs her Twitter feed with sarcasm and a tinge of sweetness. If she's pissed, you'll know it. Just ask Selena Gomez, who came under Twitter fire from the PETA activist when she painted her horse pink for a music video.
Twitter Highlight: Pink tweeted just a few weeks before giving birth: “Oh, poo. I didn’t make it to the hot bodies list of 2011. Hahahahahahahahaaaaaa.”
Alyssa Milano 6 of 11This new mom wants to reach out and connect with you (yes, you!) on Twitter. Milano told Piers Morgan: "I believe that Twitter is ... the closest thing that we truly have to a global community. There are no boundaries. We are all the same on Twitter." Aaand cue Kumbaya.
Twitter Highlight: Challenging Isaiah Mustafa, the hottie spokesdude for Old Spice, to donate $100,000 to the National Wildlife Federation Gulf Oil Spill Restoration Fund.
Alicia Keys 7 of 11The self-described "Light Bearing MOMMY!/artist/songwriter/musician/producer/actress/activist/people person"
gives her fans love via Twitter 24/7.
Twitter Highlight: Calling out George Michael on Twitter when he bailed on a fundraiser for Keep a Child Alive due to a toothache. Keys asked fans, "What kind of person bails on 15 million orphans?" then deleted it shortly after publication.
lilyallen 8 of 11Whether it's chastising Ryanair for charging her to print a boarding pass or calling Perez Hilton a "bitter lonely old queen," Allen isn't afraid to let her opinions fly online.
Twitter Highlight: This bitter exchange between Hilton and Allen. Be careful, it's not for the easily offended.
Kourtney Kardashian 9 of 11TV viewers are obsessed with the youngest mommy Kardashian and so are her Twitter followers. Expect posts about baby, celeb life, and the rest of the Kardashian clan.
Twitter Highlight: Answering your questions about what goes on with Keeping Up with the Kardashians — because, let's face it, there are lots of questions.
Ashlee Simpson Wentz 10 of 11If you're headed here to find out about Ashlee's divorce from Fall Out Boy's Pete Wentz, you won't find much. The younger Simpson keeps her personal drama fairly mum online, but you can read up on her music-writing process.
Twitter Highlight: Sweet tweets from Ash wishing her fans luck with exams and extending happy birthday messages.
Martha Stewart 11 of 11Unsurprisingly, Stewart is as cool and composed on Twitter as she is on TV. Come here for behind-the-scenes info on the show and additional DIY tips.
Twitter Highlight: Posting this link to bloopers from the show. You have to respect a celeb who's willing to show her embarrassment.