Marc Anthony and Jennifer Lopez on Sept. 28 Photo by: Kevin Mazur / WireImage.

Marc Anthony raised eyebrows Friday night when he made a special song dedication to wife Jennifer Lopez at their Los Angeles concert.

"It's a real personal song," Anthony said before belting out Journey's "Faithfully" inside a packed Staples Center. "This song has a whole new significance." The song was only one of two that he sang in English.

It was when he sang the song's lyrics "They say that the road ain't no place to start a family" that concert goers erupted in cheers. He noted to fans that the song had "quite a special significance," dedicating it to the couple's "friends" in the audience as well.

After Anthony's hour-long set (featuring music from the couple's film "El Cantante"), Lopez, 38, hit the stage asking fans "How are you, L.A.?" and later told the crowd "This is such a special time."

Lopez was clearly showing an expanding belly, continuing to wear her loose-fitting outfits on stage. She also wore noticeably low-heeled boots during the heavier dance routines.

This has been a year of firsts for Lopez. She released her first Spanish album, embarked on her first tour and - if you believe the bump - becoming a mother for the first time. But as Lopez continues to remain mum on the topic her fans have their own opinions.

"She's so pregnant!" one concert goer said as they exited the Staples Center. Another fan tells PEOPLE there was no mistaking "she had a tummy." "She wasn't moving that much," said fan Monica Hathaway, 35, from La Palma, Calif. "I'm a mother of three, I know, she's pregnant!"

But as Anthony and Lopez keep everyone guessing, one thing is certain: Anthony only has eyes for his wife. Standing at one end of the stage during their last song together, Anthony gazed at Lopez and said, "She's just fine."