Modifying a Macro Button to time stamp when the button was clicked.

I have a button that labeled "Employee Signature" that when pressed, uses an image from another part of the worksheet and places it in the signature box (it is a scan of the employee's signature). The code is as follows:

Sub rebeccawilsonsignature()
    With ActiveSheet.Shapes("rebeccawilsonsignature").Duplicate
        .Top = Range("AF66").Top
        .Left = Range("AF66").Left
    End With
End Sub

Is there a way to add to the VBA for this button so that it automatically time stamps cell AK69 with the date and time that the button was clicked; formatted as: 12/21/10 14:01

Thanks again in advance for any assistance with this!