The 20-year-old pop star and his model gal pal, 18, were photographed getting close in the Biebs' pool Wednesday,
The two have laughed off any romantic involvement in recent weeks despite spending a lot of quality time together.
Bieber can be seen rubbing Baldwin's shoulders in one snap, while he appears to be nuzzling very close to her neck in another.
Bieber shared a snap with Baldwin in the back of a car last month in effort to confirm they are not an item.
"People are crazy. I'm super single and this is my good friend u would know otherwise," he wrote.
The 19-year-old "Keeping Up with the Kardashians" star was spotted with the shirtless singer Sunday after they attended Diddy's son's 21st birthday bash Saturday evening.
Speculation was sparked that she slept over as the model appeared to be wearing similar blue pants and a red scarf from the night before.
In a further attempt to prove he is strictly platonic with Baldwin and Jenner, Bieber attended the Los Angeles Clippers game Thursday night with both teen beauties
Baldwin also took to Twitter to slam claims that the basketball outing was anything more than a fun night out for the trio.
“Just lemme knoooo how these stupid scenarios make sense to you? #peoplerdumb," she wrote.
“The 3 best friends that anyone could have,” she captioned a photo of her, Jenner and Bieber.
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