Knox's mother followed behind the former couple in their rendezvous, but there was no sign of the boyfriend Knox reportedly lives with in Seattle.
The meeting came just after they were ordered to return to Italy for a retrial over the murder of British student Meredith Kercher.
The judges in Italy's top court is looking to rule out the possibility that Kercher died during a sex game that went wrong.
The two were seen hugging, and Sollecito put his arm around her, sparking rumors that the two are back together. The move for reexamination in court has led to concerns over whether the two should be in contact.
Knox did not comment on the ruling or whether she planned to attend trial in Italy. Earlier reports said Knox was planning to stay in the U.S. rather than return to Italy to face justice. Sollecito, an Italian, has no choice but to return.
The court overturned the couple's acquittal, releasing Knox after four years of her 26-year prison sentence. The court said releasing Knox and Sollecito was "illogical" and riddled with "deficiencies [and] contradictions."