Several Instagram users had a hard time keeping calm over the weekend as Jane Oineza shared her sweet message for her onscreen partner and rumored boyfriend RK Bagatsing, who turned 33.

In an apparent confirmation of their rumored romance, the actress posted a photo of them together and in the caption described the actor as her "source of happiness".

"To this amazing person, my source of happiness... Happy birthday," she wrote, before adding a face throwing a kiss emoji.

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A post shared by Elizabeth Jane Oineza ☁️ (@janeoineza)

Responding to her birthday message, RK said: "Kinilig ako."

And it appears it wasn't just the actor who was elated by Jane's post. Fans and fellow celebrities also expressed their "kilig" over the sweet greeting, including Jake Cuenca, Joseph Marco, and Antoinette Jadaone.

Jane, 24, and RK, 33, have been rumored to be romantically involved in real life since they were paired onscreen for the first time via the 2018 teleserye Araw Gabi.

In February, the two fueled speculation that they were dating after they posted on Instagram photos suggesting they went to Lake Caliraya in Laguna together.

READ: Were Jane Oineza, RK Bagatsing together in Laguna?

It can be recalled that a year prior, Jane was tagged as the supposed third party when RK broke up with his longtime, non-showbiz girlfriend, a rumor that the actor denied in an interview with Boy Abunda.

“As far as I’m concerned, walang third party. We care about each other so much. Nag-usap kami nang maayos. We just couldn’t bring it back to what it used to be,” RK said of his ex-girlfriend at the time.

Meanwhile, in a separate interview that same month, Jane denied being officially together with RK. However, when asked of the possibility that they will be a couple, the actress said: "Wala naman akong isinasara. Hindi ko naman pinipigilan at wala rin akong hinahanap. Kung darating ay darating."