Inside Enrique Iglesias & Anna Kournikova's new life as parents as they share first baby photos (Exclusive)

Enrique Iglesias and Anna Kournikova have shared the first photos of their twins -- and they're sure to melt your heart!

The cute snaps come as ET learns how the longtime pair is enjoying their new life as parents after welcoming twins last month.

Having kept their pregnancy under wraps, the couple welcomed a son, Nicholas, and a daughter, Lucy, in mid-December, a source tells ET.

“Their family and friends didn’t even know,” the insider says. “They had been preparing for a while to have kids and are over the moon.”

“They spent a lot of time and money on their home to baby proof it,” the source adds.

See photos of Anna Kournikova and Enrique Iglesias together:

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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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On Tuesday, Iglesias took to social media to post a heartwarming snap with one of the newborns.

Lying down next to the little one, who was peacefully sleeping in a cozy, hooded gray-and-white outfit, the 42-year-old Latin pop prince adorably matched with a gray hoodie of his own.

“My sunshine,” wrote the smitten new dad, who released the video for his latest single, “El Bano,” on Friday.

Tennis star Kounikova, then posted a pic -- presumably with the other twin -- writing the same caption.

View this post on Instagram

My Sunshine

A post shared by 🐾 Anna 🎈Аня (@annakournikova) on

“Privacy is their biggest thing, but Enrique wanted to share his love with the world,” the source says. “Both are very hands-on parents.”

The two have been together since 2001, but briefly split in 2013. They recently shared their first photo together on Instagram, posing with Kournikova's brother, Alan.

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