The lavish party also introduced the couple’s friends to her mansion in L.A.’s Bel Air neighborhood which Jen has spent the last two years renovating.
Guests and the guest-of-honor were all casually attired for the affair which took place on the expansive patio and manicured grounds around the pool.
The birthday boy was in jeans — as were many of the guests — and Jen wore comfortable shorts for the party that celebrated Justin’s 42nd birthday.
It was exactly a year earlier that he proposed. Jen has said she “already feels married” and is not revealing when they’ll actually take the plunge.