Justin Bieber, Taylor Swift, and More Celebrity Twitter Pictures (Photos)

Justin Bieber bonds with his favorite ladies, Mariah Carey hits the studio, and more stars’ Twitter photos.

Heidi Klum goes behind the scenes at the American Music Awards, Justin Bieber bonds with the ladies in his life, and Mariah Carey gets back in the studio. Plus, more of the stars’ Twitter photos from this week. / Mariah Carey

Mariah Carey

Between caring for her brand-new twins, Moroccan and Monroe, and promoting her jewelry collection on the Home Shopping Network, Mariah Carey has had her hands full lately. But she still managed to make time for music. “Back in the studio for a minute … like breathing,” Carey tweeted. / Victoria Beckham

Victoria Beckham

When Victoria Beckham’s husband, David, helped lead the L.A. Galaxy to their win over the Houston Dynamo, earning them the title of MLS champions, she was there to join the celebration. Posh tweeted a photo of her soccer-star husband proudly holding the team’s trophy. “Congratulations @LAGalaxy!!!! MLS Champions!!!!! We are so proud!!!! What an amazing night x VB,” Beckham tweeted.

Justin Bieber

It’s no secret that Justin Bieber is a ladies' man. But even in the midst of some serious alleged-baby-daddy drama, the 17-year-old pop star still took time to appreciate the women in his life. “this is #LOVE—mom, grandma, great grandma—strong women,” Bieber tweeted from the Pencils of Promise Charity Gala in New York. / Katy Perry

Katy Perry

Sophia Grace Brownlee and her cousin Rosie Grace McClelland have gotten the chance to meet some major celebrities ever since they gained Internet fame for their rendition of Nicki Minaj’s “Super Bass.”  Ellen DeGeneres had the adorable Brits hit the red carpet to interview stars like Lady Antebellum, John Legend, and Joe Jonas at the American Music Awards. But the girls gave their most enthusiastic welcome to pop singer Katy Perry—even treating her to their own rendition of her hit “Firework.” The two mini-stars tweeted a photo of themselves with Perry and wrote, “Sophia Grace & Rosie with @katyperry @OfficialAMAs today.” / Denise Richards

Charlie Sheen

Despite the crazy year they’ve had, Charlie Sheen and former wife Denise Richards showed that their family still spends quality time together. Sheen showed up to their daughter Sam’s soccer practice and tweeted, “saturday is soccer! here's three great reasons why I love my weekends! xo c,” along with a photo via his WhoSay page. “So happy you were there!” Richards responded. / Sofia Vergara

Sofia Vergara

There are many who would kill for a chance to pucker up to Colombian beauty Sofia Vergara, but this week it was a colorful giant penguin that had the honor. The Modern Family star was at the London premiere of Happy Feet 2 when she tweeted a photo of herself and Lovelace, one of the penguin stars of the new film, via WhoSay. “I kissed another pinguin and I liked it,” Vergara tweeted. / Taylor Swift

Taylor Swift

Country-pop superstar Taylor Swift has had an incredibly good month. In addition to winning multiple awards (including Artist of the Year) at the American Music Awards, Bruce Springsteen graced her tour in Raleigh, N.C., last week. The rock legend played a private show for Swift and even signed her guitar. Swift tweeted a photo of the two together and wrote, “I’ll never forget when Bruce Springsteen played ‘Dancing in the Dark’ backstage at my show on my guitar, then signed it.” / The Situation

The Situation

Jersey Shore star Mike “The Situation” Sorrentino was so excited to be at the American Music Awards with electro-hip-hop band LMFAO that he momentarily forgot how to spell the award show’s abbreviation. “With @LMFAO at the #AFA’s #SexyAndWeKnowIt,” he tweeted. / Alessandra Ambrosio

Alessanda Ambrosio

Even Victoria’s Secret Angels can be charmed by vampires, as Alessandra Ambrosio proved when she tweeted a photo of herself and a cardboard cutout of Twilight star Robert Pattinson. “On my way to see my favourite vampire #breakingdawn with my sister @lineambrosio !!” the model, who is obviously Team Edward, tweeted. / Heidi Klum

Heidi Klum

Heidi Klum wowed fans and photographers on the red carpet at the American Music Awards with a metallic cutout dress by Giles Deacon. The model and Project Runway hostess then tweeted a photo of herself before taking the stage at the ceremony, writing, “Backstage at the #AMAs, what an exciting night!”

Lea Michele

The holiday spirit has certainly hit the set of Glee. The show’s leading lady, Lea Michele, got cozy with one of the Glee Project winners and the returning cast member formerly known as “Trouty Mouth,” respectively. “Me and @damianmcginty & @chordoverstreet :)” Michele tweeted happily.

Selena Gomez

For the final stop on Taylor Swift’s "Speak Now" tour at New York’s Madison Square Garden, the superstar had not one, but two very special surprises. The first was James Taylor, who did a duet with the country singer of his classic “Fire and Rain.” But the last guest to appear with Swift was none other than her best friend, Selena Gomez. The two sang Gomez’s hit “Who Says,” and she tweeted of a photo of the special moment. “Performing at Madison Square Garden with my best friend was a highlight,” Gomez wrote. “Congratulations Taylor.”