The top-5-selling singles and albums on iTunes of the week ending March 7

The top-5-selling singles and albums on iTunes of the week ending March 7:

Singles:

• “Born This Way”: Lady GaGa

• “On the Floor [feat. Pitbull]”: Jennifer Lopez

• “Forget You”: Cee Lo Green

• “S&M”: Rihanna

• “Blow”: Ke$ha

Albums:

• “21”: Adele

• “Late Nights & Early Mornings”: Marsha Ambrosius

• ”Sigh No More”: Mumford & Sons

• “Spring Break 3 ... It’s a Shore Thing”: Luke Bryan

• “Going Out In Style”: Dropkick Murphys

“The Real World” (10 p.m., MTV): The granddaddy of reality TV shows, “The Real World,” returns for its — gasp — 25th session. This time, we head to Las Vegas, where all the partying and heavy petting takes place at a posh pad in the Hard Rock Hotel and Casino.