Anna Kournikova and Enrique Iglesias reportedly welcome twins after secret pregnancy

First-time parents!

Anna Kournikova and Enrique Iglesias reportedly welcomed twins over the weekend, following a pregnancy so private that nobody even knew about it, TMZ reports.

SEE ALSO: Princess Charlotte to attend nursery school in 2018

The former tennis star reportedly gave birth to a boy and a girl in Miami on Saturday named Nicholas and Lucy.

TMZ broke the news on Monday morning and noted that the last known photo of the couple in public is from October of 2016. 

16 PHOTOS
Anna Kournikova and Enrique Iglesias together
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Anna Kournikova and Enrique Iglesias together
SUNRISE, FL - DECEMBER 08: Anna Kournikova and Enrique Iglesias attend the Y100's Jingle Ball 2012 at the BB&T Center on December 8, 2012 in Miami. (Photo by Larry Marano/Getty Images for Jingle Ball 2012)
�2010 RAMEY PHOTO REFERENCE:BRAVO MIAMI, FLORIDA, USA 13 NOVEMBER 2010 ENRIQUE IGLESIAS AND GIRLFRIEND ANNA KOURNIKOVA ENJOYED A ROMANTIC DINNER IN A FANCY RESTAURANT BRAVO/USQS (Photo by Philip Ramey/Corbis via Getty Images)
Anna Kournikova and Enrique Iglesias leave the Orange Carpet for the Miami Dolphins versus New York Jets game at Sun Life Stadium on September 26, 2010 in Miami, Florida.
�2009 RAMEY PHOTO /XPOSURE 07.JUNE.2009 - LONDON - UK ENRIQUE IGLESIAS AND ANNA KOURNIKOVA SEEN LEAVING ZUMA AFTER A NIGHT OUT WITH FAMILY! ADXLSDNR/XP (Photo by Philip Ramey/Corbis via Getty Images)
KEY BISCAYNE, FL - APRIL 02: Enrique Iglesias and girlfriend Anna Kournikova watch as Venus Williams plays her semifinal match against Serena Williams at the Sony Ericsson Open at the Crandon Park Tennis Center on April 2, 2009 in Key Biscayne, Florida. (Photo by Al Bello/Getty Images)
MIAMI - JUNE 16: Tennis player Anna Kournikova and singer Enrique Iglesias leave Big Pink restaurant during the early morning hours on June 16, 2006 in Miami, Florida. (Photo by Ralph Notaro/Getty Images)
MIAMI - JUNE 13: Former pro tennis player and model Anna Kournikova and musician Enrique Iglesias (L) attend Game Three of the 2006 NBA Finals between the Miami Heat and the Dallas Mavericks June 13, 2006 at American Airlines Arena in Miami, Florida. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. Mandatory Copyright Notice: Copyright 2006 NBAE (Photo by Jesse D. Garrabrant/NBAE/Getty Images)
MIAMI - MAY 8: Former Tennis player Anna Kournikova and singer Enrique Iglesias hold each other as they watch the the New Jersey Nets take on the Miami Heat in game one of the Eastern Conference semifinals at American Airlines Arena on May 8, 2006 in Miami, Florida. The Nets defeated the Heat 100-88. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and/or using this Photograph, user is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Doug Benc/Getty Images)
(EXCLUSIVE, Premium Rates Apply) Anna Kournikova and Enrique Iglesias (Photo by Kevin Mazur/WireImage for Sony Music)
Enrique Iglesias and fiancee Anna Kournikova (Photo by John Heller/WireImage)
Enrique Iglesias and Anna Kournikova at the premiere of 'Once Upon A Time In Mexico.' (Photo by Steve Azzara/Corbis via Getty Images)
Enrique Iglesias and Anna Kournikova during New York Premiere of Once Upon a Time in Mexico - Outside Arrivals at Loews Lincoln Square in New York City, New York, United States. (Photo by Jim Spellman/WireImage)
Enrique Iglesias and Anna Kournikova (Photo by Kevin Mazur/Getty Images)
Enrique Iglesias with girlfriend Anna Kournikova arrive at the 2002 MTV Video Music Awards at Radio City Music Hall in New York City. August 29, 2002. Photo by Evan Agostini/ImageDirect
Enrique Iglesias and Anna Kournikova arriving at the MTV Video Music Awards, Radio City Music Hall, New York, USA. (Photo by Anthony Harvey - PA Images/PA Images via Getty Images)
Enrique Iglesias and Anna Kournikova (Photo by Carmen Valdes/WireImage)
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Kournikova and Iglesias have been together since 2001, when she starred in Iglesias' "Escape" music video. They briefly separated in 2013 and have since sparked marriage rumors after she was photographed sporting a massive ring on her finger.

The couple has long kept their romance away from the public eye and have rarely shared any details of their relationship with media.

32 PHOTOS
Anna Kournikova's Style Transformation
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Anna Kournikova's Style Transformation
Anna posed for her ad campaign for Omega Watches in a tied-at-the-waist red and black top.
Looking very tan, Kournikova attended an event at a Virgin Mega Store, showing off her midriff in a red collared top.
Clearly a fan of showing off her abs, Anna attended the MTV Video Music Awards with Enrique Iglesias.
Anna attended the Arthur Ashe Kids Day at the 2003 US Open in a crop top and bright sporty pants.
Kournikova attended the New York premiere of "Once Upon a Time in Mexico," but her outfit looks a little like she ought to be relaxing on a beach in Mexico, not attending a premiere.
Anna showed off her long blonde locks at the 2003 Monte Carlo World Music Awards.
Cutting her hair short, Kournikova let the dress do the talking at the 2003 GQ Men of the Year Awards.
Celebrating the 40th Anniversary of the Sports Illustrated Swimsuit Issue, Anna wore a simple black sleeveless dress to show off her toned arms.
 Kournikova launched Gillette's "Completely Irresistible Face" Contest in Times Square, NYC.
Back to the core (abs, that is!) -- Anna wore this black crop to an event with L'Oreal Paris.
Anna wore a pretty LBD and strappy sandals to the Gala for "An Enduring Vision" charity.
Teen People celebrated its Young Hollywood issue, and Anna was in attendance in a cute casual top and jeans.
Anna attended the Teen Choice Awards in a lacy top and cropped blazer.
Kournikova took the plunge for the World Music Awards in this low glittering top.
Anna looked lovely with sultry curls at the General Motors Annual Celebrity Fashion Show.
Anna wore this drop-waisted dress to support a good cause: the "Runway For Life" Benefit for St. Jude Children's Research Hospital.
This pretty dress that Anna wore to the "Grand Slam for Children" fundraiser reminds us of rainbow sherbert.  
The Boys & Girls Clubs of America honored Kournikova with the Champion of Youth Award, and she chose a slinky black dress for the occasion.
Anna attended a benefit for The Nature Conservancy  in this white dress with a corset top.
Kournikova chose simple black and white for the Chanel Cruise Show.
Black is definitely one of Anna's favorite colors to wear, seen again in this dress for the 2008 YouthAIDS Gala.
Anna attended Destination Fashion 2009 in a white long-sleeved tee and black pencil skirt.
Anna chose a bordeaux hue for this dress, in a silhouette she's worn many times before.
Kournikova wore this belted, long-sleeved dress 
Still black, but sleeveless this time.  Anna always chooses a classic LBD.
Hand-in-hand with beau Enrique Iglesias, Anna rocks white jeans while leaving a Miami Dolphins vs. New York Jets game.
Kournikova paired a classic blazer with black shorts and a boho-inspired top for a book launch in Fort Lauderdale.
Anna looked stunning in this sparkling top with matching shorts and jacket.
Keeping true to her latest style, Kournikova wore black and white to the Players Welcome Party for Sony Ericsson.
Anna wore this asymmetrical jewel-toned dress to the BAFTA Awards.
Throwing on a blazer is always the easiest way to dress up an outfit, and those killer heels don't hurt either.
Anna stuck to her favorites black and white for the Z100 Jingle Ball.
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