Usher Serenades Doja Cat, Jessica Alba at Vegas Residency Show

Usher has a knack for spotting famous ladies at his Vegas shows these days — and Friday proved no different … with none other than Doja Cat and Jessica Alba catching his eye.

The singer was doing his thing heading into the weekend, and like he normally does — Usher made his way into the crowd as he continued to croon. Of course, he honed in on a couple of female celebs here were in the audience … the same way he has for months now.

First, he spotted Doja … who was celebrating her 28th birthday, and who seemed more than happy to entertain Usher — especially as he floated along to his song ‘There Goes My Baby.’

DC started dancing with Mr. Raymond … and they even got the rest of the concert-goers to sing along as he put the spotlight on her. She wasn’t nearly as timid as some other stars have been when Usher turns his sights onto them … a little like Alba, who was next.

It’s actually pretty funny how he noticed her … ’cause as soon as he did, he scurried on over to give her the VIP treatment — which, in this case, included a little twirl and 1-2 step!

Like we said, the guy’s been doing this all year, sometimes to the chagrin of others. There’ll undoubtedly be more examples of his signature swooning — he’s booked through December.