Britney Spears took time from her Femme Fatale tour to meet with the US Marines who made an Internet splash with their 'Hold It Against Me' YouTube video.

The pop star gave the Marines free tickets to her concert and met with them backstage at her Las Vegas, Nev. tour stop. "So honored to meet the marines of HMLA-169 'Vipers' who made that amazing HIAM video," she tweeted with a photo.

The 266 Rein Marines posted their video in April, and it has since amassed over 3.5 million views. The clip shows several Marines lip syncing to Spears' 'Femme Fatale' hit from "somewhere deep in the heart of Afghanistan."

“I am in LOVE with this … I always knew our soldiers were fierce!” Spears wrote on her Facebook page in April along with a link to the video. “Thanks for everything you guys do…”

'Hold It Against Me' was the first single from the 29-year-old's seventh album and went on to reach No. 1 on Billboard's Hot 100 chart and Hot Dance Club Songs chart. The pop star reportedly made plans in May to personally thank the Marines for their creative video.

Watch the 266 Rein Marines' 'Hold It Against Me' Video