"I think we can all agree right now we need a lot of love out there," said Ellen DeGeneres as she introduced Bruno Mars at the top of her show today. The singer-songwriter opened Ellen with a heartfelt, ukulele-driven version of the stirring Doo-Wops & Hooligans track "Count on Me" as a tribute to the victims of tragic shooting in Newtown, Connecticut, this past Friday. See it here.