Beyoncé & Jay Z Announce "On the Run" Summer Tour

Beyoncé and Jay Z are hitting the road this summer together.

Queen Bey made the announcement Monday by posting a promotional poster on her website. The picture shows the "XO" singer and the "Holy Grail" rapper embracing and wearing ski masks. The "On the Run" tour begins July 15 in Atlanta, Ga., and concludes August 5 in San Francisco, Calif.

Beyoncé's fan club members will have access to an exclusive ticket pre-sale from 10 a.m. to 10 p.m. Tuesday. The general pre-sale continues through 10 p.m. May 1, and general tickets go on sale May 2.

Here's where the power couple will be performing this summer:

July 15 – Atlanta, Georgia, Georgia Dome

July 18 – Houston, Texas, Minute Maid Park

July 20 – New Orleans, Louisiana, Mercedes-Benz Supderdome

July 22 – Dallas, Texas, AT&T Stadium

July 24 – Chicago, Illinois, Soldier Field

July 27 – Winnipeg, Manitoba, Canada, MB Investors Group Field

July 30 – Seattle, Washington, Safeco Field

August 2 – Los Angeles, California, Rose Bowl

August 5 – San Fransisco, California, AT&T Park

Beyoncé finished her Mrs. Carter Show World Tour after 132 concerts in March. Jay Z, meanwhile, is scheduled to headline Budweiser's Made in America music festival over Labor Day weekend. Rumors of a joint tour first surfaced in mid-April.

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Kim and Khloe Kardashian Did an Undercover Mud Run

Under the cover of bandanna's and a whole lot of mud, Kim and Khloe Kardashian proved that they aren't afraid to get down and dirty.

The reality stars apparently participated in the Mud Factor race in California on Saturday, sharing their disguises and a few pics with their followers on Instagram.

If only this picture had been taken after they plunged into that giant pool of muddy water.For anyone who isn't familiar, mud runs are really intense obstacle courses designed to test toughness, strength, stamina, fitness, and mental determination. The Mud Factor website also claims that the event is a "seriously fun, 5K obstacle run."

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Rihanna Takes Her Top Off for Vogue Brazil

It wouldn't be a day that ends in "y" if we didn't have a new topless Rihanna photo shoot to admire. The 26-year-old "S&M" singer graces two covers of Vogue Brasil's May issue and the Bajan beauty dons just a pair of retro high-waisted bikini bottoms inside the mag.

Rihanna, who posted several photos from her trip to Brazil on her Instagram account, was clearly quite taken with the South American country.

The sexy songstress had, until recently, been spending a lot of time with her sometime boyfriend Drake, sparking rumors the "Take Care" singers were on the outs again.The couple may have split because Drake cheated on Rihanna. The 27-year-old hop hop star reportedly flew a fan from Houston to Toronto, where the two attended a Toronto Raptors game on April 22nd.

Rihanna was photographed leaving her favorite LA eatery, Giorgio Baldi, last night with a female friend and two guys.

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Battle of The Green Queens: Gwyneth Paltrow vs. Jessica Alba

Nothing is better than two women who swear by an all-natural lifestyle going at it over who lives a greener life... Thank you, Gwyneth Paltrow and Jessica Alba! If this isn't the most "Hollywood" catfight ever, I don't know what is...

So the story goes: The latest Goop newsletter features a bunch of green products that Gwyneth and her Goop minions were using, but came to find out they weren't as "safe" as other products on the market.

"Many of the 'clean' products I proudly use and have even touted on goop have turned out to be a product of marketing, rather than actually safe," GP writes in the newsletter introduction.

It just so happens that Jessica Alba's Honest Company All-Purpose Cleanser is one of those products, and they're giving it the boot after grading it a C.

Though the ladies aren't necessarily enemies and even spent some time together at Gwen Stefani's baby shower in February, Alba has made some snarky comments about the Goop creator.

While Alba was promoting her book The Honest Life: Living Naturally and True to You last year, someone asked if her book was partly inspired by Paltrow.

Alba was quick to respond, "Gwyneth Paltrow probably lives a very similar lifestyle, but I didn't grow up with a bunch of money, so my tips are much more grounded: repurposing things and making things at home."And she's got a point. Goop is definitely one of the most pretentious sites out there.

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