MANILA - Actress-host Alex Gonzaga drew laughs on social media as she shared a video of herself singing to the baby bump of her older sister, Toni.

In a video uploaded on Instagram on Thursday, Alex is seen singing the popular song "Tatlong Bibe" to the pregnant belly of her sister, who is visibly annoyed.

Explaining Toni's reaction, Alex wrote: "Pregnancy hormone ng ate, masungit. Akala niya in-invent ko lang 'yung song, eh."

She said she could not wait to sing "Tatlong Bibe" when the baby comes out.

Kanta para sa inang ate at sa aking pamangkin...... Remix version pa ginawa ko.. Cant wait to sing it to you live.. All for the love... - Tita Cathy/Alex (pregnancy hormone ang ate masungit akala nya ininvent ko lang yung song eh)

A video posted by Alex Gonzaga (@cathygonzaga) on Jun 1, 2016 at 10:06pm PDT

Toni announced her pregnancy with her husband, director Paul Soriano, on the ABS-CBN variety show "ASAP" last April.