Luke Bryan co-wrote his first number-one hit, "Do I," with Lady Antebellum's Charles Kelley and Dave Haywood, and they celebrated the song's success with a party in Nashville Tuesday night. The three musicians kicked off the event by performing the tune, and Charles even sang the song's second verse. Luke's young son BO also approached the stage several times as his dad received a ton of plaques and certificates celebrating the number one.

"Do I" finally made it to number one after several weeks at number two late last year. Since Lady Antebellum's smash hit "Need You Now" was spending so much time at the top, for a time it looked like "Do I" might not get a shot at number one. Luke and Lady A are on the same record label, and Charles even called them up and told them they could stop promoting "Need You Now" to try to move "Do I" ahead.

It all worked out in the end, but Luke would have been happy with a number two. He was even planning a party to celebrate his second-place finish. "I was gonna call it a number two party, and I was gonna have everybody bring bathroom attire," Luke says. "Bathrobes, bring some newspaper...candles, matches, some toilet paper." Luke even joked that he was going to host the party out a manure farm right outside Nashville. We're sure the partygoers at last night's event are very thankful "Do I" made it to #1 on the chart.