SNEAK PEEK: Heidi Invites Lauren to Her Wedding on The Hills

05/25/2009 AT 12:00 AM EDT

While the world now knows Heidi and Spencer have, for better or worse, become man and wife, there's still plenty of drama leading up to their nuptials -- like that tricky issue of inviting your former BFF who hates your fiance to the wedding.

In this exclusive clip from Monday's The Hills, Heidi drops off a wedding invite to Lauren, telling her, "I'd love to have you there." LC's reaction? A loooong uncomfortable pause before she responded, "It's kind of awkward but I don't fully get why you want me there." Watch to see Heidi's surprising answer.

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