President Donald Trump celebrates the White House Easter Egg Roll in Washington, D.C., Apr. 17, 2017. Reuters

President Donald Trump kicked off the nation's 139th annual Easter Egg Roll Monday on the South Lawn of the White House. Despite concerns that the traditional event was not as well planned as in years past, the celebration seemed to go smoothly.

Alongside first lady Melania and son Barron, the president welcomed 21,000 guests and some 18,000 easter eggs to the White House to take part in the tradition that has been around since 1878. Guests were invited to participate in various activities, games and musical events as well as the central Easter Egg Roll.

Read: Sean Spicer's Past Role As The White House Easter Bunny

Families from around the country attended Monday's event to enjoy traditional activities. White House press secretary Sean Spicer, who dressed as the Easter Bunny during the Egg Roll under the George W. Bush administration, took part by reading books to children on the South Lawn.

"I just want to thank first lady Melania Tump," the president said in a speech at the event. "She worked really hard on this. She has been working on this for a long time to make it perfect and we wanted to keep it just right, but before she speaks, I want to congratulate her on this wonderful day we're going to have. Lot of people, lot of people and they're going to have a great time."

The president also thanked Barron for attending the event before inviting the first lady to speak.

"Welcome to the White House. This is the first time that my husband and I are hosting this wonderful tradition and it's great that you are all with us today," said the first lady. "I want to thank [the] military band, all the staff and volunteers who worked tirelessly to ensure that you have memorable experience. I want to thank all the military with us today and all military in this great nation, and servicemen and servicewomen all around the world who are keeping us safe. As we renew this tradition, thank you for joining us. On behalf of the president and Barron, we wish you great fun and beautiful days coming ahead of us, and happy Easter. Thank you, God bless you."

President Donald Trump blows a whistle to start the White House Easter Egg Roll alongside first lady Melania Trump and his son Barron (R) on the South Lawn of the White House in Washington, D.C, Apr. 17, 2017. Reuters