Neil joins Backstreet Boys for a round of Singalong Live, where at-home viewers Stephanie Kelly, Josh Powell and Michelle Duperval vie for the prize, filling the lyrical blanks of Backstreet Boys' "I Want It That Way."» Subscribe for More: http://bit.ly/NBCBestTimeEverNPH» Watch Full Episodes: http://bit.ly/BTEFullEpisodesBEST TIME EVER WITH NEIL PATRICK HARRIS ON SOCIAL:Like Best Time Ever with Neil Patrick Harris on Facebook: https://www.facebook.com/BestTimeEverNPHFollow Best Time Ever with Neil Patrick Harris on Twitter: https://twitter.com/nbcbesttimeeverFind Best Time Ever with Neil Patrick Harris on Tumblr: http://besttimeevernph.tumblr.com/Follow Best Time Ever with Neil Patrick Harris on Instagram: https://instagram.com/besttimeevernph/As part of NBC's fall shows in 2015, NBC's Best Time Ever with Neil Patrick Harris follows Harris as he hosts the new LIVE one-hour show that proves anything can happen - and it can happen to you!Find Best Time Ever with Neil Patrick Harris trailers, full episode highlights, previews, promos, clips, and digital exclusives here.NBC ON SOCIAL:NBC YouTube: http://www.youtube.com/nbcLike NBC: http://Facebook.com/NBCFollow NBC: http://Twitter.com/NBCNBC Tumblr: http://NBCtv.tumblr.com/NBC Pinterest: http://Pinterest.com/NBCtv/NBC Google+: https://plus.google.com/+NBCNBC Instagram: http://instagram.com/nbctvABOUT BEST TIME EVER WITH NEIL PATRICK HARRISFive-time Emmy Award winner Neil Patrick Harris is coming to NBC on a new primetime variety series based on the U.K.'s hugely popular "Ant and Dec's Saturday Night Takeaway." The show will feature comedy sketches, musical numbers, mini game shows, hidden camera pranks on celebrities and appearances by A-list stars.Best Time Ever with Neil Patrick Harris - Singalong Live with the Backstreet Boyshttps://youtu.be/4s3B1WqhYakBest Time Ever with Neil Patrick Harrishttps://www.youtube.com/BestTimeEver