Ben Affleck

E! News can exclusively reveal that the recently single Ben Affleck took his two daughters—Violet Affleck, 9, and Seraphina Affleck, 6—to attend Taylor Swift 's fifth and final concert at the Staples Center in L.A. Wednesday night. "They all had a great time," a source says of the Afflecks. "This was something they really wanted to do."

The Batman v Superman: Dawn of Justice star, 43, scored extra cool points when they went backstage to meet Taylor. "Everyone was ecstatic!" the source says of meeting the "Shake It Off" singer. "He was excited," the source adds, "as were they."

Taylor asked several stars to join her on stage. While Ben wasn't among them, she sang "Good for You" with Selena Gomez, "Smelly Cat" with Lisa Kudrow and "Mirrors" with Justin Timberlake. "They all had a great time," the source says of Ben and his family, adding that it was "made even better by JT's appearance."

(Ben and Justin, of course, co-starred in 2013's Runner Runner.)

In addition to Ben and his daughters, other famous attendees who were spotted at the concert Wednesday included Miranda Cosgrove, Nina Dobrev, Jesse Tyler Ferguson, Calvin Harris, Julianne Hough, Jaime King, Lauren Paul, Ruby Rose,Emma Stone, Zelda Williams and Reese Witherspoon, among many others.

Taylor's 1989 World Tour resumes Saturday at Petco Park in San Diego, Calif.

Ben, meanwhile, has spent a good portion of the summer in Atlanta, where his ex,Jennifer Garner, has been filming the movie Miracles From Heaven. In June, the actors announced plans to divorce after 10 years of marriage.

"After much thought and careful consideration, we have made the difficult decision to divorce. We go forward with love and friendship for one another and a commitment to co-parenting our children whose privacy we ask to be respected during this difficult time," Ben and Jennifer told E! News in a statement. "This will be our only comment on this private, family matter. Thank you for understanding."

The exes—who also have a 3-year-old son, Samuel Affleck—have continued to participate in family outings post-split. In July, allegations surfaced that Ben had an affair with the children's 28-year-old nanny, Christine Ouzounian, who no longer works for the family. The actor, for his part, has strongly denied the allegations.