After Sharon is mistaken for being "13 and under" once too often, she determines that it's because some other girls her age are better developed. So Sharon buys a pump-up bra to give Mother Nature a hand. After an initial thrill at all the extra attention her new, fuller figure is receiving, she discovers that her more mature look comes with its own unique set of problems.
SHARON: Thanks. I'll bring your jacket back.
GRIFFIN: Don't worry about it.
MARIA: It's OK. It's all over now.