Kate Upton is once again in the center of pregnancy rumors after she allegedly covered herself up while taking on the famous ALS ice bucket challenge.

On Tuesday, August 19, Upton and her boyfriend Justin Verlander took turns at accepting the ALS challenge.

Upton then posted a video via her Instagram account and wrote, "#Alsicebucketchallenge now I challenge @camerondiaz #lesliemann and @justbobbibrown."

Unlike other celebrities who also took on the same challenge recently, Upton, 22, was photographed wearing a two white long-sleeved t-shirts and black bottoms, according to Hollywood Life

Followers of the Sports Illustrated model reacted to the video but mostly commented on the model's obvious weight gain and possible pregnancy.

Instagram user @drewx27 wrote, "@j.delarosaa aye she got fat lol." @starwars28 added, "Who is Kate Upton? This is not the Kate Upton that I know?

Another person commented, "She's pregnant isn't she? There's baby bump showing behind the shirt yasss bae."

Previously, Upton was also spotted shopping with her good friend Lily Aldrige and a few days later, was once again spotted with her current boyfriend Verlander, 700WLW reported.

What most people noticed was the fact that Upton opted to drink water instead of wine, an obvious indication that suggested she could really be pregnant.

However, as of late, Upton has not yet confirmed nor deny such rumors but has suggested that she's trying to achieve a curvier body because it is what is required of her modeling career, Breathe Cast noted.

In an interview with Elle UK's September issue, Upton said, "When I first started modeling, I was a normal catalogue model. Then, I became a woman, and I was really excited about becoming a woman."

As a woman from Florida, Upton also told the publication, "It's a different view of beauty there. You are ugly if you don't have a curvy body. And I didn't have one, and then I got one. Yesss!"