Billboard Afterparty Rocks With Prince, Lumineers, Darren Criss, Neil Patrick Harris, More

SVP Branded Entertainment at Prometheus Global Media Dana Miller, publisher of Billboard Magazine Tommy Page, Nicole Levinsohn and CEO of Prometheus Ross Levinsohn attend Citi And AT&T Present The Billboard After Party at The London Hotel on February 10, 2013 in West Hollywood, California

Rick Diamond/Getty Images

Above, L-R: Prometheus Global Media SVP Dana Miller, Billboard publisher Tommy Page, Nicole Levinsohn; Guggenheim Digital Media CEO Ross Levinsohn at the Billboard Afterparty at the London Hotel (Photo: Rick Diamond/Getty Images)

It was a party fit for a Prince.

See Our Photo Gallery from the Billboard Post-Grammy Party Right Here

Billboard took over the rooftop of Hollywood’s London Hotel last night and into the wee hours of this morning for its first annual Billboard after-party during Grammy week, presented by Citi and AT&T. Ready to chill out and get down following the three-hour 55th Grammy Awards at downtown L.A.’s Staples Center, the capacity crowd wasn't disappointed.

See All of Our Grammys Coverage Right Here!

Neil Patrick Harris and E! News correspondent David Burtka by the pool (Photo: Rick Diamond/Getty Images)
With DJ Cassidy providing spinning old-school favorites (El DeBarge, Midnight Star, Staple Singers, Bee Gees, Earth, Wind & Fire and others) people in attendance included Prince, Neil Patrick Harris and David Burtka, Darren Criss, the Lumineers, Karmin, Diane Warren, Sia, Bonnie McKee, Noelle Scaggs of Fitz and the Tantrums, Joshua Radin, Lisa Loeb, Megan and Liz, Greg Kurstin, along with Ross Levinsohn (CEO of Guggenheim Digital Media) and Dana Miller (of Prometheus Global Media), Billboard editorial director Bill Werde and publisher Tommy Page, Jennifer Breithaupht and David Kovach of CITI, Kathy Willard (Live Nation), Bozoma Saint John (Pepsi), Erika Priestley (Beats ByDre), Lori Feldman (Warner Bros. Records), Charlie Feldman (BMI), Scott McCune (Coca-Cola), Peter Strickland (Warner Bros. Records), Dion Singer (Warner Music International), Liana Huth (Fuse), Michele Bernstein (William Morris Endeavor), Virginia Davis (Azoff Music), Chris Hicky (music video director), and more.

Neyla Pekarek of The Lumineers (right) with friend (Photo: Rick Diamond/Getty Images)
To the right, guests entered an expansive area covered by a see-through plastic tent. Various groupings of black rattan sofas with white cushions and glass-topped tables and chairs invitingly lined thelength of the area, featuring well-stocked bars at each end. Guests took in a 360-degree view of the city while sampling dinner and drinks from Gordon Ramsay at the London.  White-curtained VIP cabanas lined the left side; to the right were various seating areas warmed by fires.

The dancefloor was packed for most of the evening, and the revelry got so animated that toward the end of the evening -- for the first time ever at a London event -- one of the partygoers jumped in the pool and did several laps. People were so reluctant to leave that the party was extended for an hour beyond its planned closing time.

Prince, who arrived late in the party, was joined in one of the cabanas by Werde, Page, manager Julia Ramadan and assistant Nicole Valencia.
The party also featured a pop-up photo studio where attendees could stop to get their picture taken – dozens of those photos can be found here.

Above, L-R: Billboard publisher Tommy Page; PepsiCo's Bozoma Saint John; Billboard editorial director Bill Werde; MAC Presents' Marcie Allen
(Photo: Rick Diamond/Getty Images)

Décor for the event was designed and installed by New York's Allow Me Events. The Billboard After Party is produced by NewYork-based agency MAC Presents.