Here’s the synopsis for the episode 2×20 – Meet the Parent. Do not read below if you don’t want spoilers.
RYAN O’NEAL AND LATIN POP STAR DIEGO BONETA GUEST STAR – Naomi (AnnaLynne McCord) and Jen (guest star Sara Foster) are back to wreaking havoc in each others lives and just when Naomi thinks she has the upperhand, Jen slaps her back into reality. Teddy (Trevor Donovan) invites a nervous Silver (Jessica Stroup) to meet his father, Spence (guest star Ryan O’Neal), for the second time and the meeting doesn’t go quite as planned. Adrianna (Jessica Lowndes) struggles to write a new song for Laurel (guest star Kelly Lynch) and turns to Navid (Michael Steger) for support, forcing Navid to realize he still has feelings for her. Adrianna records a duet with Javier Luna (guest star/Latin recording artist Diego Boneta), a famous young pop singer, who quickly wins her over with his charm. Annie (Shenae Grimes) confronts Harry (Rob Estes) and Debbie (Lori Loughlin) about their recent marital problems, resulting in a family discussion about their future. Tristan Wilds and Ryan Eggold also star. Stuart Gillard directed the episode written by Jessica Chaffin (#220).
Source: The CW