"Proper invites have not been sent out but instead guests have been given a save the date notice," the source told Us.
The rehearsal dinner – described by the source as "an intimate affair" for "family and close friends only" – will take place on Friday.
On Saturday, "all guests will be transported in shuttles to the wedding location," the source explained.
Regarding Simpson's upcoming wedding, her spokesperson told Us: "This is a private matter. There is nothing to confirm."
Simpson, 23, and Wentz, 28, announced their engagement in April.
Usmagazine.com broke news that Simpson is pregnant with the couple's first child.
Check out recent pics of Simpson sporting a tiny bump here!
Tell Us: Would you attend Ashlee and Pete's wedding?
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Will you watch the new version of Melrose Place starring Ashlee Simpson?
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