Today, Kristin Cavallari wished a happy birthday on Twitter to her former Hills cast mate and published author Heidi Montag.

Last night, during her fifth and final 1989 performance at Los Angeles’s Staples Center, Taylor Swift brought to the stage Phoebe Buffay-Hannigan: a singer-songwriter; a pretend woman your mother likes from television; your result in multiple BuzzFeed quizzes. They sang “Smelly Cat,” Buffay-Hannigan’s most well-known tune.

Here is an incomplete list of the guests Taylor Swift has welcomed to the stage so far during her 1989 tour: Gigi Hadid, Lorde, Serayah McNeill from Empire, Lena Dunham, the U.S. Women’s soccer team, the girl group Little Mix, the girl group Fifth Harmony, and...Julia Roberts and Joan Baez!

Jennifer Aniston—who is still engaged, yes, but not pregnant, no (thank you for asking; it’s fine)—has a lot of friends. Friends who get Oscar nominations; friends who are her hairstylists; friends who proposed to her over two years ago but don’t seem to want to set a date; friends who were on Friends; friends who are so much younger than her it’s insane. One of those friends recently spoke to a radio station about her relationship with Jen.

As you know—truly, as you’ve always known—Kristin Cavallari is pregnant. She announced the news on the Kristin Cavallari app for iPhone on Monday, and it’s since been picked up by E! News, Us Weekly, and the like. But what do the people who really know Kristin think of her announcement?

Taylor Swift, proud owner of 37 best friends, does not seem like the most difficult queen bee to impress. If you are kind of famous or a model or Haim or 16 or 45 she’ll invite you on vacation with her. She’s friends with Jaime King! And someone from “Fifth Harmony.” But there is one cool, pretty white woman Taylor Swift will not hang out with:

Have you looked at Kim Kardashian's Twitter feed today? Of course you have. She's updated the world on a new character in her Kim Kardashian: Hollywood iPhone game, retweeted a compliment Piers Morgan paid her husband, and then chatted with an account that wants her to molest it.

Four hundred and ninety-six days until Kristin Cavallari's debut book Balancing on Heels drops, and today she points us to a mystery. Might she explain this mystery in her book? Hard to say, but here it is: If Kristin had to pick one person as her best friend, who would she pick?

Rowdy homeroom crew Jennifer Lawrence, Adele, and Harry Styles were spotted dining together at Craig's in Los Angeles this weekend, because they are friends. Page Six reports that the well-known threesome was "being loud and throwing olives at people walking by."

A Central Perk pop-up cafe popped up in NYC today to celebrate the beloved sitcom's 20th anniversary—the second-most labor intensive celebration to date—and, oh-my-god (Janice) a lot of people showed up to celebrate!

Just because someone else got married doesn't mean it's not Jennifer Aniston's day, too, you know.

Though rumors are constantly being thrown around of a Friends reunion, and then constantly being shot down by Pheebs, who is too busy playing air piano with Mike, she'd probably be singing a different Smelly Cat-esque tune if she knew that Friends creator Marta Kauffman might be able to stunt cast President Obama after a November 26th fundraising dinner Kauffman is hosting.