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Justin Theroux knows how to keep his ladylove Jennifer Aniston happy ... a trip to the spa!

The 42-year-old Friends star, wearing no makeup, made her way into her favorite Beverly Hills spa for a facial. The best part ... Justin, 40, drove her there and picked her up. Now that's service.

These two lovebirds have been inseparable for months. First, it started with regular hookups at Chateau Marmont, then a romantic trip to Hawaii and now they're living under the same roof in a modestly priced $3 million home.

Sounds like these two are going the distance.