Episode 60 of "Sex and the city"
s04e12 Just Say Yes

Upset with the idea of having to move out because her building is going co-op, Carrie faces an even bigger problem: Aidan suggested that they moved in together after he bought both Carrie's and the next door apartment to make one big place for them. It's a big step that needs some thinking time, which is not helped when Carrie accidentally discovers an engagement ring among Aidan's stuff. This makes her question if Aidan is really "the one" and if she is ready for it. But then again, are we ever ready? An unexpected bump into Big doesn't really help her, specially when the ring she saw has nothing to do with her – nevermind that it was Miranda who helped him pick it out. Finally, when she's not expecting, Aidan knees and pops the question. The right timing, the right place – and most important, the right ring – make Carrie say yes. Meanwhile, Miranda faces a proposal too, after she tells Steve she's pregnant with his child. But different from Carrie, Miranda is definitely not ready for marriage – specially with a second handed ring – and so they decide to raise the kid together, but separated. Samantha flies off to Rio with her new boss and doesn't wait much before entering the mile-high club, while Charlotte anticipates herself and enrolls for adopting a Mandarin baby.