GERALD RANDOLF POSIMA ANDERSON JR. (born March 7, 1989) is a Filipino actor who was then a former housemate on the reality television first season of Pinoy Big Brother: Teen Edition, and rose to fame through the Filipino teleserye Sana Maulit Muli and My Girl.

Anderson Jr. was discovered by Joross Gamboa while the latter was performing in General Santos City where Gerald is based. Joross introduced him to his manager, Jhun Reyes, who then brought him to ABS-CBN to join PBB Teen Edition. He rose to fame when he placed third overall in the first Pinoy Big Brother: Teen Edition with 293,234 votes.

He was billed as the Amboy Hottie from General Santos City. Since the end of the Pinoy Big Brother: Teen Edition, Anderson along with his love team partner have appeared together in several shows on the ABS-CBN Network and have been tapped to do several TV ads and product endorsements. Gerald also has worked on a primetime television series entitled Sana Maulit Muli which is one of the most watched TV programs in the year of 2007. They recently launched their second teleserye in ABS-CBN entitled My Girl.

Gerald along with Kim Chiu has co-starred in two movies, First Day High which premiered on September 27, 2006 and a year later, their first solo movie I've Fallen For You directed by Lino Cayetano which premiered nationwide on September 26, 2007. Gerald Jr. and Kim Chiu will also be having their 3rd team-up in a movie together entitled One Hello under Star Cinema.