The 'I Know What You Did Last Summer' star, 34, looked radiant in her tight black dress that highlighted her baby bump and always incredible figure.
Aside from giving photographers at the Manhattan event a good look at the bump, the actress also debuted a new darker, shorter hairstyle, complete with chunky fringe.
Mum-to-be Jennifer spent her Wednesday night (21 August) hosting, appropriately, an event for the Pampers Love, Sleep & Play campaign at Vanderbilt Hall.
The Ghost Whisperer star announced in June that she is expecting her first child with Client List co-star and boyfriend Brian Hallisay.
At the time she described the news as "wonderful" and said she was excited about starting a family with Brian.
Just a few days after her happy baby news, there was another dose of great news for J.L.H, with reports that Brian had proposed during a romantic holiday to Europe!
The pair met while appearing together on 2010 TV show Love Bites, but love didn't blossom until they reunited on screen for current series The Client List.
More stars expecting babies!
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