Watch : When DWTS' Alan Bersten Realized He, Emma Slater Could Be More Than FriendsAlan Bersten knows it takes two to tango—and perform other activities. That's why the Dancing With the Stars pro had a cheeky response when he was asked about his "favorite thing to do" with girlfriend and costar Emma Slater. "Well," Bersten replied with a grin during an interview with Pause Rewind published on Aug. 4, "can't say that!" Quickstepping away from the apparent NSFW answer, the 32-year-old continued, "Honestly, dancing with Emma is just unbelievable." But, according to Bersten, it did take some time to make the big leap from friends to lovers.