Only 18 years old, just out of high school, and already engaged!? And on a dare. That can't be good, right? Well in Canadian import '18 to Life' (Tue., 9PM ET on CW), Tom and Jessie seem genuinely in love. And Tom's more serious about tying the knot than she is -- which shows some unexpected maturity. And they have known each other for 12 years...

"I dare you to propose ... You now I'm kidding, right?" says Jessie.

Tom seems focused on an empty plastic bottle. But for a reason. Watch the cute way he pops the question.