Taylor Swift and Travis Kelce took a cross-country hop to spend Easter Sunday with  Jason and Kylie and their family at their home in Pennsylvania.

And Swift took another step into the heart of the Kelce clan as, DailyMail.com can exclusively reveal, Kelce’s adorable nieces, Bennie, 1, Elliotte, 3 and Wyatt, 4, were introduced to their Auntie Tay for the first time.

Kelce, also 34, and his Pennsylvania-born pop princess jetted in from Los Angeles Sunday morning for the flying visit to Jason’s home in the upscale enclave of Haverford Township just nine miles outside Philadelphia city center.

Exclusive images obtained by DailyMail.com show their car parked in the driveway of Jason’s charming stone home which has a wraparound deck and is set on an acre of landscaped gardens complete with large patio and swimming pool.

Kelce and Swift no doubt took part in the family’s annual Easter egg hunt – an Easter tradition that Swift has always enthusiastically embraced.

In 2015, then 25, Swift posted a 29-second video to her Instagram account in which she could be seen scrambling around her parents’ yard, fighting with younger brother Austin, 23, in a fierce bid to find more Easter eggs than him.

She posted it with the captioned: ‘When your parents arrange a competitive sibling Easter egg hunt failing to take into account that their children are Ross and Monica,’ a reference to the characters on Friends.

Kelce and Swift are believed to have stayed at the Four Seasons after enjoying the day with Jason and his family.

On previous visits, Swift has stayed at The Ritz Carlton and has been seen dining at the Four Season’s Jean-Georges restaurant.

They flew back to the west coast Monday morning landing at Burbank airport and deplaning amid a thicket of umbrellas around 1:30pm local time.

The couple has been all but inseparable since Swift returned to the States having completed the Australia and Asia legs of her monster Eras Tour last month and recently came back from a sun-filled vacation on the Bahamian island of Eleuthera.

Pictures showed the couple totally at ease and enjoying time together on the beach.

In one picture Kelce lay sunbathing, with one hand affectionately placed on Swift’s bikini-clad posterior. In others they enjoyed cocktails in the surf.

Swift’s next concert date isn’t until May 9, in Paris, and Kelce is expected to join his girlfriend for at least some of her European tour dates.

Meanwhile the Kansas City Chiefs tight end is currently enjoying some well-earned downtime following the team’s February Super Bowl win in Las Vegas.

Organized team activities don’t begin again until off-season workouts start at the end of May.

Kelce and Swift thrilled their legion of fans with cute Easter posts on their official fan pages on Sunday.

Kelce’s featured the grinning footballer wearing a bunny ears hat beneath the simple message ‘Happy Easter.’

He had perhaps learnt the lesson that simple is best after recently having to delete a 2010 Easter post in which Kelce, then an unknown playing for the University of Cincinnati, wrote, ‘happy Easter to all!!! #shoutout to Jesus for takin one for the team…haha.’

Meanwhile on Swift’s official fan page @taylornation, her management featured adorable footage of the singer, aged one, being held in her mother, Andrea’s arms while wearing a pink and white fuzzy bunny onesie complete with bunny ears. The silent clip shows a timestamp of March 14, 1990.

The message reads: ‘Dropping Easter eggs since March 1989. What’s your favorite era?’

The throwback video was likely filmed in Swift’s childhood home in West Reading, Pennsylvania – itself a possible ‘Easter egg’ reference to the state in which she spent Easter this year.

Swift’s habit of ‘dropping Easter eggs’ is a reference to the hidden clues, hints, and teasers for which the singer-songwriter is known.

They often give nods to the release date or title of new songs or offer clues as to who a song might be about. She also frequently features her lucky number 13 or the year of her birth, 1989.

Her fondness for such ‘Easter eggs’ has clearly rubbed off on her boyfriend as eagle-eyed fans noted that when Kelce was spotted out enjoying a game of golf with friends (most notably former NBA star Chandler Parsons) last week, his Sherwood Country Club baseball hat featured not only the year 1989 but also the embroidered figure of an archer.

According to online sleuths the year was a clear nod to Swift and the archer was a reference to Kelce’s signature move of miming firing an arrow up into the crowd when he runs out onto the field at the Chief’s home stadium of Arrowhead, Kansas City.

Fans have also pointed out that Swift performs the same move when performing ‘The Archer’ in her Eras tour.