The TV presenter looked like she was still chuckling over whatever mischief Kevin Lemon had got up to that night as she exited the Riverside Studios in central London on Wednesday (25 September).
Christine looked pretty in a feminine LBD and nude heels, teamed with a gorgeous oversized grey handbag. She kept her glossy brunette locks loose and set her tan off with smoky eye make-up.
Frank, meanwhile, went casual in maroon trousers and a simple T-shirt/blazer combination.
Christine and Frank have been engaged since June 2011 when Frank popped the question during a holiday in Los Angeles. They've been together since 2009.
Frank recently told the Evening Standard that despite rumours to the contrary, he and Christine know what they'll do when it comes to a wedding.
"We know what we're going to do and we're going to do it in our own time," he said. "She's my best mate. Simple as that. Sounds a bit corny but it is like that."
Christine and Frank were spotted enjoying a date night in London last week, attending a private art exhibition with friends including Holly Willoughy and Ant McPartlin.