Alyson Hannigan Alyson Hannigan

Is a baby on the way for How I Met Your Mother's Lily? Well, eventually.

"It's definitely something that they're thinking about, but it would definitely limit the amount of bar scenes Lily can be in," Alyson Hannigan tells "I will say they do eventually have children. We just don't know when."

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But viewers will get a hint of a bundle of joy to come on Monday's episode (8/7c, CBS) when the gang attempts to quit smoking. "There is a mention that I quit smoking when we start trying to get pregnant," the actress teases.In real life, Hannigan, 35, has an 8-month-old daughter, Satyana, and calls motherhood "the best thing I've ever done."

See the best and worst attempts at hiding pregnancies on TV

Watch the interview below to see what else Hannigan has to say about being a parent and her Mother-inspired PSA for Cascade.