Singer ends up in bed with character Barney

Britney Spears made her 2nd appearance on US sitcom How I Met Your Mother this week.

The singer reprised her role as ditzy receptionist Abby.

In the episode, which aired in the States on Monday, Abby and character Barney end up getting it on after a row.

Barney is played by Neil Patrick Harris, 34, who starred as a teenage doctor in TV show Doogie Howser, in the early 90s.

Britney, 26, gave How I Met Your Mother its highest ratings ever the first time she appeared.

SEE VIDEO Britney Spears returns for another cameo appearance on How I Met Your Mother …