Just as a reinvigorated Justin Timberlake has a new album and world tour in his sites, a blast from his past is complicating things at least a little bit.

Yesterday, Timberlake released the first single and video, “Selfish,” from his upcoming Everything I Thought It Was album coming March 15. Last night Timberlake revealed his tour plans to support the new music, unveiling details of tour markets and dates on The Tonight Show Starring Jimmy Fallon.

See the itinerary below.

ut the drop yesterday of Timberlake’s new “Selfish” single, got fans of Timberland nemesis Britney Spears thinking: Didn’t the “Oops!…I Did It Again” singer have an identically titled song in her own catalogue – why yes, she did, back in 2011 – so Spears fans set about casting their votes in a season when voting never seems to go away.

The end result: Never underestimate the devotion of Britney’s fans. Spears’ 13-year-old song entered the the Top 40 of the U.S. iTunes chart today.

One online Britney fan site that took part in getting the old song onto the charts to needle Timberlake said the prank “started as a joke.” Soon enough other Brit fans had joined the cause and the old song was building steam. “I still can’t believe that it became so big,” the original site told EW, “and we see the results we see now. We are all so happy to see her song making a come back after all these years!”

Spears fans rallied to make it happen after Timberlake announced his new single, off his first album in five years, Everything I Thought It Was, coming out March 15.

“Then we all joined in, saying that Britney Spears was coming back with a ‘brand’ new song,” the fan account said. “I still can’t believe that it became so big, and we see the results we see now. We are all so happy to see her song making a come back after all these years!”

“Then we all joined in, saying that Britney Spears was coming back with a ‘brand’ new song,” the fan account said. “I still can’t believe that it became so big, and we see the results we see now. We are all so happy to see her song making a comeback after all these years!”

In any case, Timberlake, who had a highly publicized and badly-ended romance with Spears way back when, might not have time to ponder the record chart battle, karma or anything else, as he prepares for an upcoming world tour.

Here is the itinerary for The Forget Tomorrow World Tour, announced on Fallon last night. For additional tour information and ticket information go here.