What is the fine-grained topic of the following text: And Victoria, who helped co-write a number of songs on Ariana’s Thank U, Next album, said her guest appearance was the perfect way for them to celebrate 7 Rings, which she helped pen, being at the top of America’s Billboard Hot 100 for the seventh week. Only return the topic.
Victoria's contribution to Ariana's "Thank U, Next" album and "7 Rings" song success.