On Wednesday, the couple stepped out for the Los Angeles premiere of "Ad Astra" to support the Aerosmith frontman's daughter, Liv Tyler, who appears in the sci-fi flick.
Dressed in a black button-down shirt and a matching blazer paired with olive-colored pants, the 71-year-old musician was spotted wrapping his arm around Preston. The 32-year-old opted for an all-black ensemble, which included a leather top with lace trim.
The pair kept close as they posed for the cameras, and at one point, sweetly shared a kiss.
Tyler and Preston often share snapshots of each other to social media.
In February, Tyler penned an adorable sentiment to his significant other for Valentine's Day: "NO MATTER THE WEATHER...YOU AND ME TOGETHER...TO MY LADY LOVE...HAPPIEST OF VALENTINE’S...AND TO ALL OF YOU...KISSES ALL OVER."
Tyler and Preston made their official debut at a 2016 Oscar viewing party, according to People magazine. The outlet reported that Preston previously worked as Tyler's personal assistant.