Prince William and Kate Middleton Prince William and Kate Middleton

Leaving no stone unturned, Prince William and Kate Middleton are rehearsing their balcony wedding kiss, Us Weekly reports.

The couple is scheduled to kiss before the crowd at 1:25 p.m. on April 29 and the lip-lock will be choreographed for maximum camera coverage.

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"It's not the actual kiss that needs rehearsing, I'm sure they know how to do that," an aide tells Us Weekly. "However, the angle that they come in at needs to be correct, otherwise they could block the shot and the world will miss out on that momentous moment."William and Middleton have been told exactly where to stand and at what angle to lean in for the perfect shot. "It sounds crazy, but the balcony is their moment to greet the crowds and receive well-wishes," a second source says. "They don't want to disappoint."