AP Photo/Moises Castillo
In this June 7, 2002 photo, Maria Teresa, below, and Maria de Jesus Quiej Alvarez, 11 months, are held by nurses at the Social Security Hospital in Guatemala City, Guatemala. The twins, separated in a successful operation, celebrated their 10th birthdays on Aug. 6, 2011.
AP Photo/Krista Niles
In this June 22, 2002, photo, conjoined twins Maria Teresa Alvarez, left, and Maria de Jesus Alvarez play in their hospital bed at UCLA Medical Center in Los Angeles. The twins, separated in a successful operation, celebrated their 10th birthdays on Aug. 6, 2011.
AP Photo/Jae C. Hong
The girls are now known as Josie and Teresita. Her, Laura Cajas, center, helps Josie Hull, right, hold the hand of Josie's sister, Teresita Cajas. The girls celebrated their 10th birthday on Aug. 6, 2011, in Malibu, Calif.
Reaching that first double-digit age of 10 is a milestone for any kid, but for these Guatemalan twins born conjoined at the head, it is a sign for celebration, as they've repeatedly defied the odds against survival.
AP Photo/Jae C. Hong
Actor Mel Gibson, right, blows bubbles as he greets Teresita Cajas, one of the formerly conjoined Guatemalan twin girls who were separated in a surgery in 2002, during a birthday party for Teresita and her sister, Josie Hull, in Malibu, Calif., on Aug. 6, 2011.
Not publicly known at the time of the girls' operation, Gibson and his family partnered with the Mending Kids organization to privately finance the surgeries. Gibson has remained close to the twins ever since.
AP Photo/Jae C. Hong
Josie Hull, one of the formerly conjoined Guatemalan twin girls who were separated in a surgery in 2002, swims in pool during her and sister Teresita Cajas' 10th birthday party on Aug. 6, 2011, in Malibu, Calif.
AP Photo/Jae C. Hong
Josie Hull, center right, and sister Teresita Cajas, center left, formerly conjoined Guatemalan twin girls who were separated in a surgery in 2002, celebrate their 10th birthday on Aug. 6, 2011, in Malibu, Calif.
AP Photo/Jae C. Hong
Josie Hull and sister Teresita Cajas, background right, formerly conjoined Guatemalan twin girls who were separated in a surgery in 2002, arrive for their 10th birthday party in Malibu, Calif. on Aug. 6, 2011.
AP Photo/Jae C. Hong
Josie Hull, right, gets a hug from Laura Cajas, as Josie and her sister, Teresita Cajas, background left, formerly conjoined Guatemalan twin girls who were separated in a surgery in 2002, arrive for their 10th birthday party in Malibu, Calif., on Aug. 6, 2011.
AP Photo/Jae C. Hong
Actor Mel Gibson, left, chats with Josie Hull, one of the formerly conjoined Guatemalan twin girls who were separated in a surgery in 2002, during a birthday party for Josie and sister Teresita Cajas in Malibu, Calif., on Aug. 6, 2011.
Not publicly known at the time of the girls' surgery, Gibson and his family partnered with the Mending Kids organization to privately finance the operations. Gibson has remained close to the twins ever since.
AP Photo/Jae C. Hong
Josie Hull, center, looks at a picture of her sister, Teresita Cajas, at their 10th birthday party in Malibu, Calif., on Aug. 6, 2011.
AP Photo/Jae C. Hong
Actor Mel Gibson walks with Josie Hull, center, and Josie's legal guardian, Jenny Hull, at a birthday party for Josie Hull and her twin sister, Teresita Cajas, in Malibu, Calif., on Aug. 6, 2011.
