Celebrities in L.V.: Barbra Streisand, Tony Bennett, Hunter Hayes, Whoopi Goldberg, Jay Leno, Jeff Foxworthy

Two veteran superstar singers, 90-year-old Tony Bennett and 74-year-old Barbra Streisand, will be keeping Las Vegas young and in the spotlight this weekend. For Tony, it will be all about singing his hits; for Barbra, it will possibly be about rallying her audience.