While Jennifer Lopez received a great deal of praise for her performance at Joe Biden's inauguration ceremony on Wednesday, there was one moment that left viewers baffled.

The 51-year-old multihyphenate took to the stage to perform "This Land is Your Land" and "America the Beautiful."

As her performance drew to a close, however, the star sang the words "Let's Get Loud" -- a la her megahit of the same name -- before diving back into the ending of "This Land is Your Land."

The personal touch drew plenty of negative reactions from viewers -- many of whom suspected Lopez was using the inauguration to promote her brand.

Lopez's reps did not immediately respond to Fox News' request for comment

"Let's Get Loud," often regarded as one of Lopez's signature hits, was featured on her 1999 debut studio album, "On the 6." It was originally co-written by Gloria Estefan.

The song peaked at number 39 on the Billboard charts in 2000 and spent 4 weeks on the charts.

The tune made headlines nearly a year ago when Lopez performed it as a duet with her then-11-year-old daughter Emme during the Super Bowl halftime show.