A visibly pregnant Kelly Preston proudly showed off her baby bump Saturday.  She's literally glowing in these pictures.

Kelly is with her husband John Travolta and their daughter Ella on a three-day visit to Johannesburg, South Africa in support of Australia's World Cup team.  Travolta, an experienced pilot, is a spokesman for Australia's Qantas airlines.

While there, the family made an appearance in support of the Nelson Mandela Children's Fund.  The acting couple donated $10,000 to the organization, with John saying, "Children keep you humble.  Children keep you grounded."

Kelly, 47, and John are expecting their baby later this year.  Their son Jett tragically died following a seizure 18 months ago.