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"Justin and Jessica are planning a big [summer] wedding," a source close to the couple tells People. "Jessica initially wanted a smaller, more intimate wedding, but Justin from the beginning wanted a big wedding and that's what they have decided on."
The source says the couple, who reportedly got engaged while on a holiday ski vacation last December, has decided to "include all their friends" in their ceremony and reception. Perhaps that means JT's celebrity pals -- like Jimmy Fallon, Drew Barrymore, Andy Samberg and friendly ex Cameron Diaz -- should expect an invitation.
According to the wedding insider, Timberlake and Biel -- who have been hanging out in Atlanta while the singer-actor shoots his new film, the baseball drama Trouble with the Curve -- are excited to host the lavish nuptials.
Biel, 30, who has been spotted wearing her sparkly engagement ring recently, has yet to pick a wedding gown, the source adds. But she is "very involved" in planning the wedding celebration.
The source insists that the generous groom, 31, is pulling out all the stops for the big day. "Justin has promised her the best day ever."