For the second straight season, CBS has successfully launched a new Monday sitcom, picking up “2 Broke Girls” for a full season.

Starring Kat Dennings and Beth Behrs, “Girls” averaged a 4.6 rating among adults 18-49 and more than 11 million total viewers over the past two weeks in its regular slot, sandwiched between “How I Met Your Mother” and “Two and a Half Men.”

Michael Patrick King exec produces “Girls,” the highest-rated new show of the fall season, thanks in part to the huge sampling it received (19.4 million viewers) for its debut, airing immediately after the season premiere of “Men” with Charlie Sheen replacement Ashton Kutcher.

Whitney Cummings, who co-wrote the pilot for “Girls” and serves as an exec consultant for the Warner Bros. TV series, has now had both of her shows picked up for a full season — her NBC sitcom “Whitney” received the greenlight Tuesday.

Matthew Moy, Jonathan Kite and Garrett Morris co-star in “Girls.”

The pickup cements CBS’ Monday night lineup, which wraps with “Mike & Molly” at 9:30 p.m. and “Hawaii Five-0” at 10. CBS’ other new comedy for the fall, Thursday’s “How To Be a Gentleman,” is less secure after dropping roughly 40% of the audience from its “The Big Bang Theory” lead-in when it premiered Sept. 29.

CBS has pushed back the start date of veteran “Rules of Engagement,” which has been slated for Saturdays, to Oct. 15. The comedy is a potential replacement for “Gentleman” on Thursdays if the latter continues to shed viewers.