A post shared by Kimberly Sue Chiu ?? (@chinitaprincess) on Jul 12, 2017 at 5:14am PDT

She may gush over Justin Bieber, but it is clear that Kim Chiu only has one man in her heart at the moment.

The "Ikaw Lang ang Iibigin" star took to Instagram on Wednesday to post a sweet birthday note for rumored boyfriend Xian Lim. It also doubles as a good luck message for Lim, who will be holding a concert this weekend.

"You always prove that with hard work and drive to succeed, you can meet any goal you set your mind to!" Chiu wrote as the caption to a photo of Lim. "Before this day ends, just want to greet this talented human being a HAPPY HAPPY BIRTHDAY!"

"Good luck on your concert this Saturday! I know this will be another feather in your cap! Congrats in advance!" she added.

Lim will be performing at Solaire's The Theater on Saturday for a gig, which was partly produced by his fans, titled "Songs in the Key of X."

He appeared earlier this week on "Tonight with Boy Abunda" to promote the show. During his guesting, he had to deny his rumored breakup with Chiu.

"I get it if people will have that conclusion," Lim explained. "I mean I can't say that it's completely OK but it's part of it. It's easy kasi to get confused with the characters we portray in the teleseryes and the movies and in personal life."

The speculations began when Chiu was cast alongside her ex-boyfriend Gerald Anderson in the series, "Ikaw Lang ang Iibigin." Fans were quick to draw conclusions that Lim allegedly became jealous, paving the way towards a breakup.

Both Chiu and Lim have yet to confirm that they are a couple.