Kelly Preston reveals the advice she and John Travolta give their teen daughter (exclusive)

You might need to sit down for this one: John Travolta and Kelly Preston's adorable daughter, Ella, is already 18 years old -- and she's happily following her parents into the spotlight!

As the now-grown Ella pursues her own Hollywood path, AOL asked Kelly at the New York premiere of "Gotti" what advice she and John give their daughter about entering the business.

"Keep your integrity, be true to yourself, hold strong, and don't let anyone take advantage of you," Kelly told AOL. "And you're an amazing artist."

The Travolta family loves sharing the screen: John and Kelly co-star "Gotti," and teenage Ella joins her father in an upcoming flick, much to John's excitement.

"First day of shooting with my daughter Ella Bleu for the film Poison Rose," John proudly captioned an on-set snapshot.

And can we just say -- she's beautiful! The Instagram is in the gallery below:

John and Kelly are also parents to 7-year-old Benjamin, who joined the family at Cannes Film Festival last month for a rare full family photo (above). They tragically lost son Jett in 2009.

"Gotti," the story of iconic New York mobster John Gotti, is in theaters now.