Credit: Kevin Mazur/WireImage for UNICEF

Forget flowers, candy and chocolate.

Brad Pitt and Angelina Jolie spent Valentine's Day together at home in Los Angeles... with Sean Penn, a source tells

Conversation topics could have included New Orleans, where the Jolie-Pitts own a $3 million home, and where Penn once famously rode a boat while holding a machine gun after Hurricane Katrina. Penn and Pitt, 45, also co-star in sci-fi flick Tree of Life, which is set to hit theaters later this year.

Penn also went to Haiti in January; Jolie, 34, returned from the earthquake-stricken country last Thursday.

According to a report in the UK Sun, Jolie bought Pitt an $18,500 olive tree to plant at their $60 million French chateau.

Last Friday, Pitt and Jolie took their kids to a Los Angeles Benihana for dinner, as first reported by (The couple have also treated their kids to McDonald's and the low-key Cafe Metro in New York City.)

Earlier this month, Pitt and Jolie threatened to sue the UK tabloid News of the World for reporting they were planning to split.