However, her mother had to leave to continue her work commitment abroad and Rivera was sent to her maternal grandmother, Francisca Rivera, in Bacoor, Cavite.
On 31 March 2014, she lent her star power to promote the rights of women and children with disabilities in the country as she was appointed by the Congress of the Philippines as Ambassador for Women and Children with Disabilities.
She proposed a public-private partnership for the establishment of a special school for children with disabilities so that they can have better access to education.
In 2012, Rivera headlined on different programs of GMA Network such as My Beloved, a Filipino romance drama-suspense-thriller series created and written by RJ Nuevas, under the helm of Dominic Zapata and Lore Reyes.
The series premiered on 13 February 2012, it follows the life and love story of an angel of death named Arlan, a fictional character portrayed by Dantes, who falls in love with a human named Sharina, played by Rivera.
This prompted her to appear for the first time on ABS-CBN, rival network of GMA 7.
She appeared on three consecutive episodes of Kris TV, a taped interview in Showbiz Inside Report, and a live interview on The Buzz with Delas Alas.
She stated that helping out the victims is her 28th birthday gift to herself.
She also said that she didn’t mind getting wet and tired during the mission, as she says it was a small sacrifice compared to the hardships that the victims are experiencing.
On the latter part of the year, Rivera adds another advocacy to her list as she actively supports "Smile Train", an international children’s charity with a sustainable approach to a single, solvable problem: cleft lip and palate.
In 2013, Rivera was declared by FHM Philippines as "the sexiest woman in the Philippines", making her second to reclaim the coveted title five years after she first won it (the first was Angel Locsin, who won it in '05 and '10). stated, "In our choice, for instance, of Marian Rivera[...]she provided the excitement, fresh look and instant recognition the brand needed.
Gawad Sulo ng Bayan Natatanging Pilipinang Aktres sa Pelikula at Telebisyon on Golden Torch CCA, Inc., and the 2nd PEPList Choice Awards for its Newsmaker of the Year category, with Dingdong Dantes, was accepted by ABS-CBN newscaster Korina Sanchez on behalf of the couple.