Derek Hough appears to be getting closer to popping the question to girlfriend Hayley Erbert, but he's not ready to share any plans!

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When asked about potentially proposing marriage to Hayley by the end of 2019, the 34-year-old World of Dance judge and former Dancing with the Stars pro partner played coy.

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"Who knows. You never know. It's the end of a decade, sorry, it's the beginning of a new decade!" Derek told Us Weekly.

Derek spoke to the magazine during a joint interview with his sister Julianne Hough after they performed at the 87th Annual Rockefeller Center Christmas Tree Lighting Ceremony at Rockefeller Center in New York City on Wednesday.

"2020 vision, we'll see," Derek adding, teasing how we're close to welcoming the new year.

Derek and Hayley, 25, met on Dancing with the Stars and have been linked for over three years, reportedly starting in 2015. The couple has been going strong and supporting each other ever since.

Last month, for example, Hayley stayed by Derek's side in the hospital when he had to undergo emergency surgery on his appendix.

Derek insisted in 2017 he didn't feel any pressure to tie the knot and have children given he comes from such a big family.

"Not at all!" Derek had explained to Us at the time. "Oh, no. If anything, [we have] a lot of [family], there's like 55 nieces and nephews. We got plenty, we're fine!"

Derek and Hayley, who also competed on So You Think You Can Dance, kept their romance fairly private in the beginning stages.

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Derek and Hayley recently enjoyed a trip to South Korea in which Derek gushed on Instagram they met "great people," enjoyed "great food," and had an "amazing experience" together. Not long before that, the couple also went to Paris, France.
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In recent months, the couple hasn't been shy to share their love for one another on social media.

Prior to starring on World of Dance, Derek competed on 17 seasons of Dancing with the Stars, with his last appearance being on Season 23 with his celebrity partner Marilu Henner. Derek won more mirrorball trophies than any other pro on the show, with a total of six wins.

Dancing with the Stars just wrapped its 28th season on ABC late last month.

Season 3 of World of Dance wrapped earlier this year, however NBC has renewed the show for a fourth edition will air on NBC in 2020.

RELATED LINK: 'DANCING WITH THE STARS' PROS AND THEIR SIGNIFICANT OTHERS: WHO'S DATING OR MARRIED TO WHOM!? (PHOTOS)