Another romance bites the dust.

After only dating for roughly three months, it appears as if Zac Efron and Lily Collins are going their separate ways, according to Us Weekly.

Sources told the publication that split was most likely due to their hectic schedules. "They're no longer together," one source said. "They were never serious, though; it was just a casual thing and it fizzled. They were never in the same place at the same time."

This development comes just hours after reports of Miley Cyrus' brother Trace Cyrus and fiance Brenda Song calling off their engagement. In addition, it's been reported that Denise Richards and Richie Sambora have ended their relationship as well. Looks as if these celebrity breakups come in threes!