The song "This Christmas Day" by Jessie J is a heartfelt tribute to a loved one who has passed away. The lyrics express the speaker's unwavering love and longing for their departed loved one during the holiday season. The song begins by emphasizing that material possessions like diamonds or fancy cars are not important to the speaker. They only need the guidance and presence of their loved one to mend their broken heart and make them feel complete. The speaker acknowledges that things are not the same without their loved one and they miss their presence. However, they choose to celebrate and smile, even though they are holding back tears. They cherish the memories of the good times they shared and wish that their loved one could be there to share in the celebration. The lyrics also convey the belief that their loved one is in a beautiful place and that they will be reunited one day. The speaker closes their eyes and imagines hearing their loved one saying that they love them, assuring them that their love will never change. Overall, "This Christmas Day" is a poignant song that conveys the deep love, longing, and hope for the future that the speaker feels for their departed loved one, particularly during the holiday season.