<b>Fast Track:</b> Arnold Schwarzenegger and Maria Shriver have separated

A roundup of entertainment headlines for Tuesday.

Arnold Schwarzenegger and Maria Shriver have separated after 25 years of marriage. (Los Angeles Times)

Celebrity feud o’ the week: Marg Helgenberger versus Justin Bieber, Round 2: The Bieber fires back. (Los Angeles Times)

Whitney Houston is back in rehab for drugs and alcohol. (Los Angeles Times)

Steven Tyler tried his darnedest to pick up on “Parks & Recreation’s” Aubrey Plaza on “The Tonight Show” on Monday night. She wasn’t buying it. (Huffington Post)

Warren Buffett will appear on the season finale of “The Office.” America is now split in two: those who are going to watch “The Office” season finale and those who are appearing in it. (Hollywood Reporter)

“Gossip Girl” will be back for a fifth season, but Taylor Momsen and Jessica Szohr won’t be there. (TV Line)

Filmmaking madman Terry Gilliam has directed his first opera. (BBC)

The entire-cast recording of “The Book of Mormon” is now streaming online. Give it a listen. Now. (NPR)

The ongoing mystery of the father of January Jones’ child moves on to new suspects who aren’t Jason Sudeikis. (E! Online)

Lindsay Lohan attended a gallery show where she was overrun by paparazzi and given escort by a guy wearing a machine gun. Her life is only getting weirder. (New York Daily News)

Microsoft will buy Skype for $8.5 billion. (Los Angeles Times)

-- Patrick Kevin Day

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