For famous celebrity couples, it is an almost-impossible feat to keep a pregnancy secret for the full nine months. However, Enrique Iglesias and partner Anna Kournikova pulled it off, only announcing they had twins on Dec. 16, 2017.

The healthy baby twins were named Nicholas and Lucy, and it is obvious through their Instagram posts that Iglesias, 42, and Kournikova, 36, were proud parents. The very first photos of the twins were with their parents giving them a kiss. Both babies were in onesies, and both Instagram posts from the couple were captioned "My sunshine."

The pair, famous for being private, laid low again after they proudly introduced their babies to the world. However, perhaps after she recovered from delivery, Kournikova recently uploaded an Instagram video of her dancing to Iglesias' latest tune, "El Baño."

The day out was on a boat, and Kournikova even brought her dogs on the escapade. Incidentally, it seems that the former tennis star was making a habit of dancing to Iglesias tunes while on a boat.

Fans may remember her singing perfectly to Iglesias' "Duele el Corazón" in 2016, which was also done while she was on a boat ride. She captioned the photo by saying that the "dancing marathon continues."

Iglesias and Kournikova have been together for more than a decade— 16 years to be exact. However, they were never married. Nor do the couple have any plans of marriage in the future.

When asked about the matter, Kournikova said that she "believes in marriage and commitment," but adds that she is happy as she is.

Iglesias and Kournikova first met while shooting the music video for Spanish singer's 2011 hit, "Escape." The former tennis star resigned from the sport in 2007.

The couple now reportedly keeps themselves busy by giving to charity. They are "very private but very generous with local charities," a source said.