Angelina Jolie & Brad Pitt's Birthday Weekend in Sin City

Spending his birthday weekend with the family in Sin City, Brad Pitt and partner Angelina Jolie took a few of their little ones out for a stage show in Las Vegas on Saturday night (December 17).

The "Mr and Mrs Smith" co-star couple escorted Maddox, Pax, Zahara and Shiloh into the Mandalay Bay Hotel & Casino for a performance of Cirque du Soleil’s Michael Jackson: The Immortal World Tour.

The outing comes after the show opened in Vegas two weeks ago, with the act described as "a riveting fusion of visuals, dance, music and fantasy that immerses audiences in Michael’s creative world and literally turns his signature moves upside down.”

As for Papa Pitt's birthday, the "Fight Club" stud is ringing in his 48th today (December 18). Happy Birthday, Brad!

Enjoy the pictures of Brad Pitt and Angelina Jolie taking the kids to see the Immortal: Michael Jackson Cirqu du Solieil show (December 17).

Angelina Jolie's 'in-laws' have a Pitt stop at premiere

It has been claimed there has been tensions between the screen beauty and her fella's folks as Bill and Jane Pitt were believed to be very fond of their son's ex-wife Jennifer Aniston.

But all seemed rosy as the quartet posed together at In The Land Of Blood And Honey's after party at The Standard Hotel Rooftop in New York.

Bill and Jane followed Angelina's lead by dressing in all-black outfits.

Jane hugged Angelina, 36, around the waist, while Brad, 47 ? decked out in a three-piece suit ? hugged his partner from the other side.

Angie appeared relaxed despite a Croation journalist suing her for alleged copyright infringement.

The Tomb Raider star wrote and directed In The Land of Blood and Honey, which chronicles the romance between a rape and kidnap victim and one of her captors and is set against the backdrop of the 1990s Bosnian Civil War.

Jolie and the producers of the film, which is set to be released on December 23, have been sued by reporter James Braddock ? who claims the movie violates copyright of his 2007 book The Soul Shattering.

In the suit, filed in Illinois last Friday, Braddock alleges he met with Edin Sarkic, a producer on the film, in 2008 to talk about the possibility of turning his book into a film but nothing came of the discussions.

Braddock is seeking statutory damages and an injunction against the film.