03/26/2008 at 12:00 AM EDT
's return to television has scored big with some critics -- and in the ratings.
Monday's episode of How I Met Your Mother
featuring the pop star earned the CBS comedy its highest rating ever -- netting a 4.5 preliminary rating among adults 18-49, according to the Hollywood Reporter
. That means about 10.7 million viewers tuned in to watch Spears, making Mother
the fourth-highest-rated show of the evening.
On the sitcom, Spears played a receptionist at a dermatologist's office who develops a crush on a patient played by Josh Radnor
. See a clip from Spears's performance here