NEW YORK (AP) - CBS apologized on Sunday for an unexpectedly R-rated end to its Super Bowl halftime show, when singer Justin Timberlake tore off part of Janet Jackson's top, exposing her breast. ``CBS deeply regrets the incident,'' spokeswoman Leslie Anne Wade said after the network received several calls about the show.The two singers were performing a flirtatious duet to end the halftime show, and at the song's finish, Timberlake reached across Jackson's leather gladiator outfit and pulled off the covering to her right breast.The network quickly cut away from the shot, and did not mention the incident on the...