Big Sean at Detroit's Lincoln High SchoolBig Sean spent Monday serving as principal for the day at Warren, Michigan's Lincoln High School, winners of the Get Schooled's Detroit Attendance Challenge. Lincoln High competed against 16 other area schools and took first place by improving its attendance record by 8.56 percent year-over-year during the competition.

Big Sean was joined by other celebrity Michigan natives. Royce da 5'9 performed and Mike Posner made an appearance. The "Dance (A$$)" rapper told Hip Hop Media Training that the experience reminded him of his days attending the city's Waldorf School and Cass Technical High School, where he graduated with a 3.7 GPA.

Thi'sl and his motherFinally, a two-step jam for mamas. St. Louis rapper Thi'sl sends a shout out to his mother, grandmother and single mothers with his song, "Hey Moma," a nice mid-tempo track. On the record featuring an R&B chorus from Fitzgerald, Thi'sl apologizes for having been a troublesome youth.

New mom Beyonce now has her own tribute song for her first Mother's Day this Sunday. In January, Beyonce and husband Jay-Z welcomed their first child, daughter Blue Ivy. Up-and-coming girl group, The Gurlie Gurlz, changed a few lyrics in the pop star's hit "Love On Top" to turn it into a song celebrating moms.

Tupac and mom, Afeni ShakurArizona Cardinals defensive end Calais Campbell is helping The Aftermath celebrate Mother's Day with a three-song mixtape that pays homage to his parents, namely his mom, Nateal.

Campbell, who just signed a five-year contract with the Cardinals, included entries from Tupac Shakur, Kanye West and J. Cole on his list of favorite songs.

Dawn RichardIt doesn't seem like it's been 8 years since Diddy introduced us to Dawn Richard on "Making The Band 3." Though all the ladies of Danity Kane are great talents there was always something special about Dawn who even stood out as a member in "Making The Band"'s offshoot girl group Danity Kane.

When Danity Kane disbanded, there were whispers that Diddy was grooming Dawn for a solo career. But instead of immediately putting out her own album, Dawn first joined the Bad Boy head's new group, Diddy Dirty Money.

Chris Brown (photo: Brendon Thorne/Getty Images)Did Chris Brown just sink Rihanna's Battleship?

R&B bad boy Chris Brown appears to be slamming Rihanna in a freestyle rap he posted on his Twitter page Wednesday night.

Over an instrumental of Kanye West's already controversial "Theraflu," Brown dismisses an unnamed ex-girlfriend, calling her promiscuous.

The singer-rapper, who plead guilty to assaulting Rihanna in February 2009, raps, "Don't f—k with my old b-tches like a bad fur, every industry n----a done had her."

HEAR Chris Brown's "Theraflu" freestyle (WARNING EXPLICIT LYRICS)

He adds, "Treat it like a pumpkin just to smash her. B-tches breaking codes but I'm the password."

O.A.R., B.o.B., and Diji Parq

O.A.R. and B.o.B. premiere Tuesday their collaborative song and video "Champions," a rock-meets-hip-hop teaming for Duracell's "Rely On Copper To Go For The Gold" program that supports the 2012 London Olympic Games.

The "Rely On Copper" initiative gives Olympic fans a way to celebrate athletes competing oversees. Users can use Duracell's Virtual Stadium on Facebook and Twitter to send encouragement via videos, pictures and texts messages.

DOWNLOAD free copy of "Champions" on Duracell's Facebook page

Jay-Z and Blue Ivy

Tough guy rapper and shrewd mogul Jay-Z shows a softer side when discussing parenthood.

Jay-Z explained his philosophies on raising children on "Oprah's Master Class: Special Edition" that aired Sunday on OWN. In January, Jay-Z and his wife Beyonce welcomed the birth of their first child, daughter Blue Ivy.