06/11/2010 AT 7:00 PM ET
There are some major perks of having famous parents – just ask Ava Phillippe.
Witherspoon, 34, who’s working with the Twilight heartthrob on Water for Elephants, introduced her daughter to Pattinson, 24, Thursday on the movie’s Piru, Calif., set.
“Ava seemed especially excited to meet him,” an onlooker tells PEOPLE, who also notes that younger brother Deacon, 6, chatted with the British actor.
“The filming with Rob is going really well,” adds an on-set source “and Reese was excited for the kids to meet him.”
Reporting by PERNILLA CEDENHEIM