She also proudly showed off the sparkler in a New Year's Eve photo alongside pal Sofia Richie, 19.
Zylka's latest projects include TV series Sometimes it seems celebs can only find Hollywood endings onscreen.
The pricey piece of jewelry features a 20-carat center stone set on a platinum split shank halo band which boasts another two carats of smaller diamonds, according to People.
Jeweler Michael Greene and his team designed the ring in two days, a process which normally takes several weeks.'Paris was not involved.
“Around 5 o’clock, I went out and watched the sun go down.
Keely sat beside me, we had a glass of champagne and talked about the day,” he said in 2017.
"All I can say is that it’s an effing blast," she said.