London: Executives of TV show "How I Met Your Mother" made crew and security members wear security wristbands while singer Britney Spears filmed her part.

Spears will do a cameo on the show, thesun.co.uk reports.

TV star Neil Patrick Harris said: "They wouldn't let me on the stage because I didn't have the proper wristband. I said to the security people: 'Lady, I am actually on the show'. We had words and I eventually made it on set."