There are those out there who believe that romance can do wonders for one’s attitude and appearance - and it looks to be having quite the positive effect on Jennifer Aniston.

The former Friends star was in great spirits on the Pennsylvania set of “Marley and Me” on Monday morning (May 19), dressed casually and covered up in a big jacket to protect her from the rainy weather.

According to an inside on the scene, “Aniston was glowing and smiled cheerfully, perhaps with memories of John Mayer and his wonderland of a body bouncing around her mind.”

Of the budding relationship, a source close to the situation tells: “She’s really into John, and the nine year age difference doesn’t bother her for a second. Jen’s already telling friends she’s falling in love with this guy.”

Enjoying a break from her busy filming schedule, Jennifer Aniston took in the rays at the swimming pool by a Florida hotel on Saturday (April 19).

The 39-year-old former Friends star is currently residing in the Sunshine state while she films “Marley & Me” alongside Owen Wilson.

In related news, as previously reported by Gossip Girls, Aniston is lined up to be the surprise guest star on tonight’s (April 20) season finale of Oprah’s Big Give, airing at 8 PM on ABC.

Of appearing on the show, Jen tells: “I wouldn’t miss it … This is such an amazing, fantastic thing, to see all of these people compete to outgive each other.”