A day after making the official announcement that Nicki Minaj will be joining Britney Spears‘ North American Summer tour, Nicki called Ryan Seacrest to fill us in on what to expect in the highly-anticipated show.

“I’m calling to let everyone know how thrilled I am — how honored I am to be going on the road with the iconic miss Britney Spears this Summer,” said Nicki in an exclusive voicemail left for “On Air with Ryan Seacrest.” “I just know that when the Femme Fatales and The Barbs get together we’re going to kick major ass.”

She continued, “I’m looking forward to creating a new, a bigger, a brighter, a more spectacular show, and I’m just really, really excited to make history with Britney.”

Tuesday after the announcement, Nicki tweeted to Britney, “let’s keep the “other thing” a secret for now.” What the secret is, no one knows but as we get closer to the opening date of the concert in Sacramento, CA, keep listening to “On Air with Ryan Seacrest” as he gets more info from Britney and Nicki.

Britney Tweeted fans about the tour, saying:

"First day of tour rehearsals for my Femme Fatale tour. Feeling it! Tour's gonna be hot. I'm excited people..."

Britney and Jason were seen out yesterday night. They were leaving El Ray theater. Jason covered Britney with a blanket in Los Angeles.

Twilight star Taylor Lautner talks about Britney in a new interview with MTV. He says he'd love to be on Glee and sing "Oops!... I Did It Again," and admits to "loving" Femme Fatale.

Britney was seen heading to a studio in North Hollywood, California. Our girl is probably getting ready for the tour! April 13, 2011. You can check out some of the photos by clicking on one of the thumbnails below.

Britney takes the second spot this week on the Billboard 200 with sales of 77K. Adele climbs to numer one with sales of 88K for album 21.

Pop star Britney Spears has been voted one of the hottest mums in Hollywood - despite not actually having custody of her own children.

Britney, 29, came third in a US television survey behind actresses Halle Berry, 44, and Angelina Jolie, 35.

But the Till The World Ends singer is said to be planning a court bid to win back ­custody of sons Sean ­Preston, five, and Jayden James, four, later this year.

For the time being, online voters in a US cable television poll think Britney is back to her hot self and ready to care for her two boys again.

Salma Hayek, Jessica Alba, Jennifer Lopez, Kate Beckinsale, Christina Aguilera, Teri Hatcher and Monica Bellucci, rounded off the top ten hot Hollywood mums.

Could not think of a sexier Femme Fatale than @NickiMinaj to come on tour with me! Gonna be a hot summer people! -Brit

@britneyspears Hot INDEED Your Fierceness!!! This tour’s gonna KICK ASS!!! The #FemmeFataleBARBZ r READY!!! Let’s GO!!!

@NICKIMINAJ The #FemmeFataleBARBZ wont know what hit em. Ready or not people, here we come…. -Britney

@britneyspears yup! and let’s keep the “other thing” a secret for now…

@NICKIMINAJ All good things to those who wait…. -Britney

Pop music trendsetter Britney Spears, who has continually captivated crowds around the world with her live music events, today confirms special guest Nicki Minaj will join the Femme Fatale touring event of the summer. The all female line-up includes Jessie and the Toy Boys and Nervo on every tour stop. Spears has prepared an extraordinary show in support of the North American tour that begins on June 17th in Sacramento at the Power Balance Pavilion. Tickets for select markets go on sale beginning April 30th at Ticketmaster.com and LiveNation.com.

“This is the Femme Fatale tour and I’m thrilled to have the hot Nicki Minaj join me and Jessie and the Toy Boys and Nervo will get everyone on the dance floor,” said Spears. “Can’t wait to take the Femme Fatales on the road.”

FEMME FATALE NORTH AMERICAN TOUR DATES

Jared reportedly mentioned on Z100 last night that Britney might release Till The World Ends as a remix featuring a special guest... Any idea who it might be? Who would you like to see Britney collaborate with on her hit single?