AceShowbiz -

Jennifer Lopez rarely uses her Twitter to express her love for Casper Smart, but she made an exception for a very special occasion recently. On Friday, April 6, the estranged wife of Marc Anthony gave a shout-out to her younger boyfriend, who also works as her backup dancer, in celebration of his 25th birthday.

The 42-year-old singer wrote on her account, " 'Beau has a birthday we're so glad hope its the happiest birthday Beau ever has...etc.' :) #singingtweet HAPPY BIRTHDAY BEAR!!!!!!!!!!!!!!!" Around the same time, her boyfriend also tweeted, "Thank u all so much for the birthday wishes, I really appreciate them and u!!! :)"

Lopez's tweet came around a week after Smart put out a photo of them enjoying a romantic moment together at a beach. The picture posted on Twitter last Friday, March 30 displays the "On the Floor" hitmaker and her boyfriend sitting side by side in matching white shirt as they watched the sun rises together.

The couple began dating shortly after Lopez and Anthony announced their separation after seven years of marriage in July 2011. While the "American Idol" judge stayed silence about their age gap, her backup dancer boyfriend tweeted in January 2012, "Age, status, n opinions of others are irrelevant. Our hearts are endless and our souls infinite."