Ellen DeGeneres grilled birthday girl Britney Spears about her new boyfriend, David Lucado, during an interview that airs on Tuesday's episode of her talk show. Brit was there to celebrate the release of her album Britney Jean, which is officially out now. Britney talked about what made her want to head to Vegas, whether her boys are allowed to sing "Work B*tch", and how she met David. The pop star admitted that she's in love with her boyfriend of eight months, but she also revealed what exactly got them into a little "tiffy" this week. Thankfully, it all sounds like it's smoothed over now!