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She'd teamed her beautiful beaded mini dress by Dolce & Gabbana with cute strappy-sandals and black toe polish.
Her appearance this week was a contrast to her last public appearance when her loose jacket seemed to suggest she was hiding something.
Although there'll be no big announcement on the baby front, Jen has clearly found her soul mate in Justin Theroux.
The pair didn't pose together on the red carpet, but they looked blissfully happy when they were pictured together inside the event.
All the news as Duchess Kate's due date draws close...