If there's one notable thing about Austin Mahone's and Becky G's relationship, it's that they always make sure to be present at each other's birthday party. Sure enough, Becky was with her rumored boyfriend when the latter celebrated his 19^th birthday party last April 2.

The birthday bash, which was held on a yacht overlooking an ocean, consists of Mahone's closest friends. According to Hollywood Life, the "Mmm Yeah" singer topped off the celebration with a birthday cake shaped like a basketball, which the crooner took an Instagram video of. He also enjoyed riding a pair of jet-skis.

Becky, who also recently celebrated her 18^th birthday party with Mahone, posted a cute snapshot of the two of them during the fun day. In the photo she posted on her official Instagram page, the "Shower" singer was seen sporting a necklace with the words "Happy Birthday" while making a kiss face. Mahone, on the other hand, was beaming at the camera.

In another photo Becky posted, the two were seen lounging in a built-in pool on the yacht.

Becky G's New Song About Austin Mahone?

Becky, whose real name is Rebbeca Marie Gomez, recently released a new song called "Lovin' So Hard," Hollywood Life reported. Naturally, fans have speculated that the track was about Mahone and signifies that things between them are getting serious. Mahone previously dated Fifth Harmony member Camilla Cabello.

If the speculations are to be believed, Mahone is also no different from Becky when it comes to writing songs for each other. Another Hollywood Life report has stated that Mahone's new track, titled "Someone Like U", is directed at the young songstress. In a video clip he posted on Instagram, he was seen in a dimly lit studio surrounded by candles, setting off a romantic vibe. He sings, "Someone like you/ Someone like you/ Cause you wrap me up with loving/ I can see us start to."

Rumors about Becky and Mahone fired up in February when they were spotted being flirty in a recording studio. The pair have reportedly "spent so much time goofing off" and Mahone was even seen "lifting her up and carrying her over his shoulder" fireman style, a separate report from Hollywood Life revealed. The insider also shared that the crooner was always teasing Becky, "but it's so obvious he's doing it to flirt with her."

The duo also rode side-by-side in a rollercoaster ride in an amusement park in Florida, J-14 reported. Twist Magazine also pointed out that Mahone's favorite workout was inspired from Becky's. In a photo he posted on Instagram, he was featured kick boxing for the first time, a sport which his rumored flame was also fond of.

Despite these rumors, the two have insisted that they are just friends.