Hollywood superstars Angelina Jolie(R) and Brad Pitt, seen here in January 2007 and who last week boosted the size of their family to four, are reportedly set to return to the big screen with lead roles in separate movies.[AFP]

Hollywood superstars Angelina Jolie and Brad Pitt, who last week boosted the size of their family to four, are reportedly set to return to the big screen with lead roles in separate movies.

According to the Hollywood entertainment daily Variety, Jolie, 31, is to play a killer-for-hire in an action flick called "Wanted" alongside actor Morgan Freeman, who won a best supporting actor Oscar for his role in the 2005 Clint Eastwood film "Million Dollar Baby."

She will portray as assassin who teaches a younger man how to kill in the graphic novel-based thriller, to be distributed by Universal studios and directed by Russian Timur Bekmambetov whose credits include "Spiderman 2."

Pitt, 43, will act as an investigative journalist in "State of Play," a movie based on a British mini-series, with reporters and police racing to unravel the murder of a politician's mistress.

Director Kevin McDonald said he was "absolutely hooked on" the BBC-televised drama, and "wanted to do something that tackles the way we as a society in America and Europe learn what's going on, and how much we can trust newspapers and the nightly news."

Pitt, who earns around 20 million dollars per film, is one of the best paid actors in Hollywood and recently starred in "Babel."

Jolie last week adopted a three-year-old boy Vietnamese boy who was abandoned at birth.

The boy, who Jolie said she will name Pax Thien, is the fourth child for Jolie and fellow film star partner Pitt, who lives with her in New Orleans.

The couple already have five-year-old Maddox, adopted from Cambodia, a two-year-old daughter, Zahara, who was adopted in Ethiopia, and a biological daughter, Shiloh, born last May in Namibia.

The star-studded couple acted together in the 2005 film "Mr. and Mrs. Smith."

They first met the Vietnamese boy during a Thanksgiving Day trip last November, while on a break from filming in India of "A Mighty Heart," a movie about the 2002 abduction and murder of US journalist Daniel Pearl by Islamic militants in Pakistan.

"A Mighty Heart" is set to be released in June.

Jolie, who won an Oscar in 2000 for best supporting actress for her role in "Girl, Interrupted," is a goodwill ambassador for the UN refugee agency and has visited scores of refugee camps in Africa, Asia and South America.