Angelina Jolie is displaying her love for her four children with a series of tattoos on her left arm. The 31-year-old actress has etched the geographical co-ordinates for the countries all her kids were born in. Maddox was born in Cambodia in 2002, Zahara Marley in Ethiopia in January 2005, Shiloh Nouvel in Namibia in May 2006 and Pax Thien in Vietnam in 2004. The family tribute is the 13th tattoo Jolie has done. The co-ordinates are on the same place on Jolie's arm as her 'Billy Bob' tattoo, which she had removed after splitting from ex-husband Billy Bob Thornton in 2003.