Albert L. Ortega/WireImage
04/19/2009 AT 04:00 PM EDT
Mel Gibson, who spent last week in Costa Rica following news of his pending divorce
, traded his beach clothes for a suit and tie so he could attend his private church in Malibu on Sunday.
"He was drinking coffee with church guests and seemed very relaxed," a churchgoer said about Gibson, who mingled with the other congregants for about an hour after Mass.
Before Sunday, the actor-filmmaker was spotted near his sprawling estate in Costa Rica just days after his wife Robyn filed for divorce
after 28 years of marriage. Gibson, 53, has been recently linked
to Russian musician Oksana Grigorieva, 39.
The actor, who appeared to be on vacation, was not alone. He was spotted with a blonde-haired woman, a man in his 20s and a young boy who never left his side, said a witness. Grigorieva was not seen on their outings.
"[He] went to eat ice cream and then he went shopping,” said José Morales, an employee at a car-rental agency, who spotted the group last week.
The visitors ordered espresso and double-scoops of ice cream before Gibson spent more than $500 on souvenirs, which included wooden bowls and potholders, says another witness.
On Saturday, Gibson left Costa Rica. He was seen Sunday attending 9 a.m. Mass at the Church of the Holy Family
, hidden in the tree-covered mountains outside of Los Angeles.
With additional reporting by LELAND BAXTER NEAL